Pending Review
Last Updated: 13 Dec 2019 15:01 by n/a

Hello,

I've got an issue and feel like it link to RadComboBox control.

I've got an application which displays a RadDocking with multiple elements. Some of them are RadCombobBox and they get their value from a view model.

Sometimes, and quite ofen, I've got an exception : "NullReferenceException occured in PresentationCore.dl" without more information... I can't find the origin of this exception since theis was thrown by an external code.

The awkward thing is that, when I put some breakpoints, I don't have the exception. It seems like there is a temporisation problem.

Here is an exemple of my view model code for a RadComboBox component :

        private IEnumerable<EnumMemberViewModel> _videoTypes;

        public IEnumerable<EnumMemberViewModel> VideoTypes
        {
            get
            {
                if (_videoTypes == null)
                {
                    _videoTypes = EnumDataSource.FromType<EVideoType>();
                }
                return _videoTypes;
            }
        }

        private EnumMemberViewModel _currentVideoType;
       
        public EnumMemberViewModel CurrentVideoType
        {
            get
            {
                return _currentVideoType;
            }
            set
            {
                if (_currentVideoType != value)
                {
                    _currentVideoType = value;
                    OnPropertyChanged(() => CurrentVideoType);
                    AcquireVideo.InvalidateCanExecute();
                }
            }
        }

And here my xaml code for my view (if it can help):

<UserControl x:Class="AltosIHM.SessionControlPaneRadDocking"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:system="clr-namespace:System;assembly=mscorlib"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
             xmlns:local="clr-namespace:AltosIHM"
             xmlns:resx="clr-namespace:AltosIHM.Properties" 
             xmlns:iMatlabWCF="clr-namespace:MatlabWCFInterface;assembly=MatlabWCFInterface"
             xmlns:iMatlabTreatment="clr-namespace:MatlabTreatmentInterface;assembly=MatlabTreatmentInterface"
             xmlns:maskedInput="clr-namespace:Telerik.Windows.Controls.MaskedInput;assembly=Telerik.Windows.Controls.Input" 
             mc:Ignorable="d" 
             MinHeight="300" d:DesignWidth="900">
    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="CommonStyles.xaml"/>
            </ResourceDictionary.MergedDictionaries>

            <telerik:InvertedBooleanConverter x:Key="InvertBooleanConverter"/>
            <local:StringToDoubleConverter x:Key="StringToDoubleConverter"/>

            <Style TargetType="StackPanel" x:Key="HeaderElements">
                <Setter Property="Orientation" Value="Horizontal"/>
            </Style>

            <Style x:Key="TextHeader" TargetType="TextBlock">
                <Setter Property="VerticalAlignment" Value="Center"/>
                <Setter Property="Margin" Value="3 0"/>
            </Style>

            <Style x:Key="TextHeaderDocumentPane" TargetType="TextBlock" BasedOn="{StaticResource TextHeader}">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type telerik:RadDocumentPane}}, Path=IsPinned}" Value="False">
                        <Setter Property="Visibility" Value="Collapsed"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>

            <Style x:Key="TextHeaderPane" TargetType="TextBlock" BasedOn="{StaticResource TextHeader}">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type telerik:RadPane}}, Path=IsPinned}" Value="False">
                        <Setter Property="Visibility" Value="Collapsed"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>

            <Style x:Key="HeaderImg" TargetType="Image">
                <Setter Property="Width" Value="30"/>
            </Style>

            <Style TargetType="telerik:RadPane">
                <Setter Property="CanUserClose" Value="False"/>
                <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
                <Style.Triggers>
                    <Trigger Property="IsPinned" Value="False">
                        <Setter Property="RenderTransform">
                            <Setter.Value>
                                <TransformGroup>
                                    <RotateTransform Angle="90"/>
                                </TransformGroup>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Margin" Value="0 0 3 0"/>
                    </Trigger>
                </Style.Triggers>
            </Style>

            <Style TargetType="telerik:RadDocumentPane">
                <Setter Property="CanUserClose" Value="False"/>
                <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
                <Style.Triggers>
                    <Trigger Property="IsPinned" Value="False">
                        <Setter Property="RenderTransform">
                            <Setter.Value>
                                <TransformGroup>
                                    <RotateTransform Angle="90"/>
                                </TransformGroup>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Margin" Value="0 0 3 0"/>
                    </Trigger>
                </Style.Triggers>
            </Style>


            <Style x:Key="ParametersTitle" TargetType="TextBlock" BasedOn="{StaticResource CategoryTitle}">
                <Setter Property="HorizontalAlignment" Value="Left"/>
                <Setter Property="Margin" Value="10"/>
            </Style>

            <Style x:Key="SessionParametersValue" TargetType="{x:Type Control}" BasedOn="{StaticResource ParametersValues}">
                <Setter Property="Width" Value="300"/>
                <Setter Property="HorizontalAlignment" Value="Left"/>
            </Style>

            <DataTemplate x:Key="TreatmentsTemplate" DataType="{x:Type iMatlabTreatment:ITreatment}">
                <Button Style="{StaticResource TileButton}" IsEnabled="{Binding IsManageableByIHM}"
                                                    CommandParameter="{Binding}"
                                                    Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=local:SessionControlPaneRadDocking}, Path=DataContext.ActiveTreatment}">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition/>
                            <RowDefinition/>
                        </Grid.RowDefinitions>

                        <Image Source="{Binding IconPath}"/>
                        <Label Grid.Row="1" Content="{Binding MatlabTreatmentExternalName}"
                                               FontWeight="Bold" HorizontalAlignment="Center"/>
                    </Grid>
                </Button>
            </DataTemplate>
            <ItemsPanelTemplate x:Key="TreatmentItemPanel">
                <WrapPanel x:Name="PropertiesWrapPanel" Width="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type telerik:RadPaneGroup}}, Path=ActualWidth}"/>
            </ItemsPanelTemplate>

            <DataTemplate x:Key="IntCameraProperty">
                <StackPanel Margin="0 3">
                    <TextBlock Width="180" Text="{Binding Name}" Style="{StaticResource ParametersTitle}"/>
                    <telerik:RadNumericUpDown Value="{Binding IHMValue}" Style="{StaticResource SessionParametersValue}"
                                            IsEnabled="{Binding Accessible}" HideTrailingZeros="True"/>
                </StackPanel>
            </DataTemplate>
            <DataTemplate x:Key="IntBoundedCameraProperty">
                <StackPanel Margin="0 3">
                    <TextBlock Width="180" Text="{Binding Name}" Style="{StaticResource ParametersTitle}"/>
                    <DockPanel>
                        <telerik:RadNumericUpDown Value="{Binding IHMValue}" Style="{StaticResource SessionParametersValue}"
                                            IsEnabled="{Binding Accessible}" HideTrailingZeros="True"
                                                Minimum="{Binding ConstraintValueInt[0]}" Maximum="{Binding ConstraintValueInt[1]}"/>
                    </DockPanel>
                </StackPanel>
            </DataTemplate>
            <DataTemplate x:Key="DoubleCameraProperty">
                <StackPanel Margin="0 3">
                    <TextBlock Width="180" Text="{Binding Name}" Style="{StaticResource ParametersTitle}"/>
                    <telerik:RadNumericUpDown Value="{Binding IHMValue, Converter={StaticResource StringToDoubleConverter}}" NumberDecimalDigits="16"
                                                IsEnabled="{Binding Accessible}" Style="{StaticResource SessionParametersValue}" />
                </StackPanel>
            </DataTemplate>
            <DataTemplate x:Key="DoubleBoundedCameraProperty">
                <StackPanel Margin="0 3">
                    <TextBlock Width="180" Text="{Binding Name}" Style="{StaticResource ParametersTitle}"/>
                    <telerik:RadNumericUpDown Value="{Binding IHMValue, Converter={StaticResource StringToDoubleConverter}}"
                                                IsEnabled="{Binding Accessible}" NumberDecimalDigits="16"
                                                Minimum="{Binding ConstraintValueDouble[0]}"
                                                Maximum="{Binding ConstraintValueDouble[1]}"
                                                Style="{StaticResource SessionParametersValue}" />
                </StackPanel>
            </DataTemplate>
            <DataTemplate x:Key="StringCameraProperty">
                <StackPanel Margin="0 3">
                    <TextBlock Text="{Binding Name}" Style="{StaticResource ParametersTitle}"/>
                    <TextBox Text="{Binding IHMValue}" Style="{StaticResource SessionParametersValue}" IsReadOnly="{Binding Accessible, Converter={StaticResource InvertBooleanConverter}}"/>
                </StackPanel>
            </DataTemplate>
            <DataTemplate x:Key="EnumCameraProperty">
                <StackPanel Margin="0 3">
                    <TextBlock Text="{Binding Name}" Style="{StaticResource ParametersTitle}"/>
                    <telerik:RadComboBox ItemsSource="{Binding ConstraintValueString}" SelectedValue="{Binding IHMValue}" 
                                        IsReadOnly="{Binding Accessible, Converter={StaticResource InvertBooleanConverter}}"
                                        Width="300" HorizontalAlignment="Left"/>
                </StackPanel>
            </DataTemplate>

            <DataTemplate x:Key="CameraPropertiesTemplate">
                <ContentControl Content="{Binding}">
                    <ContentControl.Style>
                        <Style TargetType="ContentControl">
                            <Style.Triggers>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding Type}" Value="{x:Static iMatlabWCF:ETypeCameraProperty.Int}"/>
                                        <Condition Binding="{Binding IsConstraintValueExist}" Value="False"/>
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="ContentTemplate" Value="{StaticResource IntCameraProperty}"/>
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding Type}" Value="{x:Static iMatlabWCF:ETypeCameraProperty.Int}"/>
                                        <Condition Binding="{Binding IsConstraintValueExist}" Value="True"/>
                                        <Condition Binding="{Binding Constraint}" Value="bounded"/>
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="ContentTemplate" Value="{StaticResource IntBoundedCameraProperty}"/>
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding Type}" Value="{x:Static iMatlabWCF:ETypeCameraProperty.Double}"/>
                                        <Condition Binding="{Binding IsConstraintValueExist}" Value="False"/>
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="ContentTemplate" Value="{StaticResource DoubleCameraProperty}"/>
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding Type}" Value="{x:Static iMatlabWCF:ETypeCameraProperty.Double}"/>
                                        <Condition Binding="{Binding IsConstraintValueExist}" Value="True"/>
                                        <Condition Binding="{Binding Constraint}" Value="bounded"/>
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="ContentTemplate" Value="{StaticResource DoubleBoundedCameraProperty}"/>
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding Type}" Value="{x:Static iMatlabWCF:ETypeCameraProperty.String}"/>
                                        <Condition Binding="{Binding IsConstraintValueExist}" Value="False"/>
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="ContentTemplate" Value="{StaticResource StringCameraProperty}"/>
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding Type}" Value="{x:Static iMatlabWCF:ETypeCameraProperty.String}"/>
                                        <Condition Binding="{Binding IsConstraintValueExist}" Value="True"/>
                                        <Condition Binding="{Binding Constraint}" Value="enum"/>
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="ContentTemplate" Value="{StaticResource EnumCameraProperty}"/>
                                </MultiDataTrigger>
                            </Style.Triggers>
                        </Style>
                    </ContentControl.Style>
                </ContentControl>
            </DataTemplate>
        </ResourceDictionary>
    </UserControl.Resources>

    <Grid>
        <DockPanel Background="LightGray">
            <telerik:RadDocking Name="SessionMainPanel" PaneActivationMode="LastActivated" Background="LightGray" 
                                ElementLoaded="SessionMainPanel_ElementLoaded">
                <telerik:RadDocking.DocumentHost>
                    <telerik:RadSplitContainer>
                        <telerik:RadPaneGroup Background="AliceBlue" telerik:StyleManager.Theme="Fluent">
                            <telerik:RadDocumentPane Title="{x:Static resx:Resources.Treatments}" telerik:RadDocking.SerializationTag="TreatmentsPane"
                                                     CanUserClose="False" IsDragDisabled="True">
                                <telerik:RadDocumentPane.Header>
                                    <StackPanel x:Name="TreamtentPanel" Style="{StaticResource HeaderElements}">
                                        <TextBlock Text="{x:Static resx:Resources.Treatments}" Style="{StaticResource TextHeaderDocumentPane}"/>
                                        <Image Source="/icons/matlab.png" Style="{StaticResource HeaderImg}"/>
                                    </StackPanel>
                                </telerik:RadDocumentPane.Header>
                                <telerik:RadTileList ItemsSource="{Binding Treatments}" ItemTemplate="{StaticResource TreatmentsTemplate}"
                                         HorizontalAlignment="Center" VerticalTilesAlignment="Center">
                                </telerik:RadTileList>
                            </telerik:RadDocumentPane>
                        </telerik:RadPaneGroup>
                    </telerik:RadSplitContainer>
                </telerik:RadDocking.DocumentHost>
                <telerik:RadSplitContainer InitialPosition="DockedLeft" telerik:StyleManager.Theme="Fluent">
                    <telerik:RadPaneGroup>
                        <telerik:RadPane Title="{x:Static resx:Resources.CameraParameters}" telerik:RadDocking.SerializationTag="CameraParamsPane"
                                         IsPinned="False" CanUserClose="False">
                            <telerik:RadPane.Header>
                                <StackPanel x:Name="CameraParamsPanel" Style="{StaticResource HeaderElements}">
                                    <TextBlock Text="{x:Static resx:Resources.CameraParameters}" Style="{StaticResource TextHeaderPane}"/>
                                    <Image Source="/icons/camera.png" Style="{StaticResource HeaderImg}"/>
                                </StackPanel>
                            </telerik:RadPane.Header>
                            <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Hidden" Width="Auto" Background="#f6fcff" >
                                <ScrollViewer.Resources>
                                    <Style TargetType="TextBlock">
                                        <Style.Triggers>
                                            <DataTrigger Binding="{Binding AllCameraProperties.Count}" Value="0">
                                                <Setter Property="Visibility" Value="Visible"/>
                                            </DataTrigger>
                                        </Style.Triggers>
                                    </Style>

                                    <Style TargetType="StackPanel">
                                        <Style.Triggers>
                                            <DataTrigger Binding="{Binding AllCameraProperties.Count}" Value="0">
                                                <Setter Property="Visibility" Value="Collapsed"/>
                                            </DataTrigger>
                                        </Style.Triggers>
                                    </Style>
                                </ScrollViewer.Resources>
                                <Grid>
                                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="25"
                                    Margin="0 25" Style="{StaticResource CategoryTitle}" Visibility="Collapsed"
                                    Text="{x:Static resx:Resources.NoCameraProperty}"/>
                                    <StackPanel>
                                        <ListView HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch"
                                                  ItemsSource="{Binding AllCameraProperties}" Background="#eff9ff"
                                                  ItemTemplate="{StaticResource CameraPropertiesTemplate}"
                                                  ItemsPanel="{StaticResource TreatmentItemPanel}"/>
                                        <WrapPanel HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0 0 70 0">
                                            <telerik:RadButton Margin="10"
                                                    Command="{Binding WriteProperties}" Content="{x:Static resx:Resources.WriteParameters}"/>

                                            <telerik:RadButton Margin="10" 
                                                    Command="{Binding ResetProperties}" Content="{x:Static resx:Resources.ResetParameters}"/>

                                            <telerik:RadButton Margin="10"
                                                    Command="{Binding SetProperties}" Content="{x:Static resx:Resources.SetParameters}"/>

                                        </WrapPanel>
                                    </StackPanel>
                                </Grid>
                            </ScrollViewer>
                        </telerik:RadPane>
                        <telerik:RadPane Title="{x:Static resx:Resources.AcquisitionParameters}" telerik:RadDocking.SerializationTag="AcquisitionParamsPane"
                                         IsPinned="False" CanUserClose="False">
                            <telerik:RadPane.Header>
                                <StackPanel x:Name="AcquisitionParamsPanel" Style="{StaticResource HeaderElements}">
                                    <TextBlock Text="{x:Static resx:Resources.AcquisitionParameters}" Style="{StaticResource TextHeaderPane}"/>
                                    <Image Source="/icons/acquisitionParams.png" Style="{StaticResource HeaderImg}"/>
                                </StackPanel>
                            </telerik:RadPane.Header>
                            <ScrollViewer VerticalScrollBarVisibility="Visible">
                                <StackPanel Background="#f6fcff">
                                    <telerik:RadExpander Header="{x:Static resx:Resources.Images}" Background="LightSteelBlue" IsExpanded="True">
                                        <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Hidden">
                                            <Grid x:Name="ImagesParametersGrid" Background="#f6fcff">
                                                <Grid.Resources>
                                                    <Style TargetType="StackPanel">
                                                        <Setter Property="Margin" Value="10 8"/>
                                                    </Style>
                                                </Grid.Resources>
                                                <Grid.RowDefinitions>
                                                    <RowDefinition/>
                                                    <RowDefinition/>
                                                    <RowDefinition/>
                                                    <RowDefinition/>
                                                    <RowDefinition/>
                                                </Grid.RowDefinitions>
                                                <Grid.ColumnDefinitions>
                                                    <ColumnDefinition/>
                                                    <ColumnDefinition/>
                                                    <ColumnDefinition/>
                                                </Grid.ColumnDefinitions>

                                                <StackPanel>
                                                    <TextBlock Text="{x:Static resx:Resources.FrameTrigger}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadNumericUpDown Style="{StaticResource SessionParametersValue}"
                                                          Value="{Binding FramePerTriggerNumber}" HideTrailingZeros="True" Minimum="0"/>
                                                </StackPanel>

                                                <StackPanel Grid.Column="1">
                                                    <TextBlock Text="{x:Static resx:Resources.TriggerRepeat}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadNumericUpDown Style="{StaticResource SessionParametersValue}"
                                                          Value="{Binding TriggerRepeatNumber}" HideTrailingZeros="True" Minimum="0"/>
                                                </StackPanel>

                                                <StackPanel Grid.Column="2">
                                                    <TextBlock Text="{x:Static resx:Resources.TriggerFrameDelay}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadNumericUpDown Style="{StaticResource SessionParametersValue}"
                                                          Value="{Binding TriggerFrameDelayNumber}" HideTrailingZeros="True" Minimum="0"/>
                                                </StackPanel>

                                                <StackPanel Grid.Row="1">
                                                    <TextBlock Text="{x:Static resx:Resources.FrameGrabInterval}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadNumericUpDown Style="{StaticResource SessionParametersValue}"
                                                          Value="{Binding FrameGrabInterval}" HideTrailingZeros="True" Minimum="1"/>
                                                </StackPanel>

                                                <StackPanel Grid.Row="1" Grid.Column="1">
                                                    <TextBlock Text="{x:Static resx:Resources.TriggerType}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadComboBox ItemsSource="{Binding Types}" SelectedIndex="1" SelectedItem="{Binding CurrentType, Mode=TwoWay}" Width="300" HorizontalAlignment="Left"/>
                                                </StackPanel>

                                                <StackPanel Grid.Row="1" Grid.Column="2">
                                                    <TextBlock Text="{x:Static resx:Resources.FilePrefix}" Style="{StaticResource CategoryTitle}"/>
                                                    <TextBox Style="{StaticResource SessionParametersValue}" Text="{Binding FilePrefix}"/>
                                                </StackPanel>


                                                <Grid Grid.Row="2" Grid.ColumnSpan="3" Margin="10 8">
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition/>
                                                    </Grid.ColumnDefinitions>
                                                    <Grid.RowDefinitions>
                                                        <RowDefinition/>
                                                        <RowDefinition/>
                                                        <RowDefinition/>
                                                    </Grid.RowDefinitions>
                                                    <TextBlock Text="{x:Static resx:Resources.ImagesDirectory}" Style="{StaticResource CategoryTitle}"/>
                                                    <TextBox IsReadOnly="True" Text="{Binding FolderName}" Style="{StaticResource SessionParametersValue}" Width="Auto" HorizontalAlignment="Stretch" Grid.Row="1"/>
                                                    <telerik:RadButton Margin="8" HorizontalAlignment="Right" Grid.Row="2"
                                                   Content="{x:Static resx:Resources.ChooseFolder}" 
                                                   Command="{Binding ChooseFolder}"/>
                                                </Grid>

                                                <StackPanel Grid.Row="3">
                                                    <TextBlock Text="{x:Static resx:Resources.GenerateMean}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadToggleButton Style="{StaticResource RadToggleSwitch}" HorizontalAlignment="Left" Margin="20 0 0 0"
                                                                 IsChecked="{Binding IsMeanGenerate}"/>
                                                </StackPanel>

                                                <StackPanel Grid.Row="3" Grid.Column="1">
                                                    <TextBlock Text="{x:Static resx:Resources.Format}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadComboBox ItemsSource="{Binding Formats}" SelectedIndex="0" SelectedItem="{Binding CurrentFormat, Mode=TwoWay}" Width="300" HorizontalAlignment="Left"/>
                                                </StackPanel>

                                                <StackPanel Grid.Row="3" Grid.Column="2">
                                                    <TextBlock Text="{x:Static resx:Resources.BitDepth}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadToggleButton Style="{StaticResource RadToggleSwitch}" HorizontalAlignment="Left" Margin="20 0 0 0"
                                                                 IsChecked="{Binding ApplyBitDepth}"/>
                                                </StackPanel>
                                            </Grid>
                                        </ScrollViewer>
                                    </telerik:RadExpander>

                                    <telerik:RadExpander  Header="{x:Static resx:Resources.Video}" Background="LightSteelBlue" IsExpanded="True">
                                        <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Hidden">
                                            <Grid x:Name="VideoParametersGrid" Background="#f6fcff">
                                                <Grid.Resources>
                                                    <Style TargetType="StackPanel">
                                                        <Setter Property="Margin" Value="10 5"/>
                                                    </Style>
                                                </Grid.Resources>
                                                <Grid.RowDefinitions>
                                                    <RowDefinition/>
                                                    <RowDefinition/>
                                                </Grid.RowDefinitions>
                                                <Grid.ColumnDefinitions>
                                                    <ColumnDefinition/>
                                                    <ColumnDefinition/>
                                                </Grid.ColumnDefinitions>

                                                <Grid Grid.ColumnSpan="2" Margin="10 8">
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition/>
                                                    </Grid.ColumnDefinitions>
                                                    <Grid.RowDefinitions>
                                                        <RowDefinition/>
                                                        <RowDefinition/>
                                                        <RowDefinition/>
                                                    </Grid.RowDefinitions>
                                                    <TextBlock Text="{x:Static resx:Resources.VideoDirectory}" Style="{StaticResource CategoryTitle}"/>
                                                    <TextBox IsReadOnly="True" Text="{Binding VideoFolderName}" Style="{StaticResource SessionParametersValue}" Width="Auto" HorizontalAlignment="Stretch" Grid.Row="1"/>
                                                    <telerik:RadButton Margin="8" HorizontalAlignment="Right" Grid.Row="2"
                                                   Content="{x:Static resx:Resources.ChooseFolder}" 
                                                   Command="{Binding ChooseVideoFolder}"/>
                                                </Grid>

                                                <StackPanel Grid.Row="1">
                                                    <TextBlock Text="{x:Static resx:Resources.FileName}" Style="{StaticResource CategoryTitle}"/>
                                                    <TextBox Style="{StaticResource SessionParametersValue}" Text="{Binding VideoFileName}"/>
                                                </StackPanel>

                                                <StackPanel Grid.Row="1" Grid.Column="1">
                                                    <TextBlock Text="{x:Static resx:Resources.Format}" Style="{StaticResource CategoryTitle}"/>
                                                    <telerik:RadComboBox ItemsSource="{Binding VideoTypes}" SelectedIndex="2" SelectedItem="{Binding CurrentVideoType, Mode=TwoWay}" Width="300" HorizontalAlignment="Left"/>
                                                </StackPanel>
                                            </Grid>
                                        </ScrollViewer>
                                    </telerik:RadExpander>
                                </StackPanel>
                            </ScrollViewer>
                        </telerik:RadPane>
                        <telerik:RadPane Title="{x:Static resx:Resources.TreatmentParameters}" telerik:RadDocking.SerializationTag="TreatmentParamsPane"
                                         IsPinned="False" CanUserClose="False">
                            <telerik:RadPane.Header>
                                <StackPanel x:Name="TreatmentsParamsPanel" Style="{StaticResource HeaderElements}">
                                    <TextBlock Text="{x:Static resx:Resources.TreatmentParameters}" Style="{StaticResource TextHeaderPane}"/>
                                    <Image Source="/icons/settings.png" Style="{StaticResource HeaderImg}"/>
                                </StackPanel>
                            </telerik:RadPane.Header>
                            <StackPanel>
                                <TextBlock Text="{x:Static resx:Resources.DefaultColor}" Style="{StaticResource CategoryTitle}"/>
                                <telerik:RadColorEditor SelectedColor="{Binding ColorTreatments, Mode=TwoWay}" ColorMode="RGB" />
                            </StackPanel>
                        </telerik:RadPane>
                        <telerik:RadPane Title="{x:Static resx:Resources.ViewerParameters}" telerik:RadDocking.SerializationTag="ViewerParamsPane"
                                         IsPinned="False" CanUserClose="False">
                            <telerik:RadPane.Header>
                                <StackPanel x:Name="ViewerParamsPanel" Style="{StaticResource HeaderElements}">
                                    <TextBlock Text="{x:Static resx:Resources.ViewerParameters}" Style="{StaticResource TextHeaderPane}"/>
                                    <Image Source="/icons/viewerParams.png" Style="{StaticResource HeaderImg}"/>
                                </StackPanel>
                            </telerik:RadPane.Header>
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>

                                <StackPanel>
                                    <TextBlock Text="{x:Static resx:Resources.ColorsSpace}" Style="{StaticResource CategoryTitle}"/>
                                    <telerik:RadComboBox ItemsSource="{Binding ColorsSpaces}" SelectedIndex="0" SelectedItem="{Binding CurrentColorsSpace, Mode=TwoWay}" Width="300" HorizontalAlignment="Left"/>
                                </StackPanel>
                                <StackPanel Grid.Column="1">
                                    <StackPanel.Style>
                                        <Style TargetType="StackPanel">
                                            <Setter Property="IsEnabled" Value="False"/>
                                            <Style.Triggers>
                                                <DataTrigger Binding="{Binding CurrentColorsSpace.Value}" Value="{x:Static iMatlabWCF:EReturnedColorSpace.Bayer}">
                                                    <Setter Property="IsEnabled" Value="True"/>
                                                </DataTrigger>
                                            </Style.Triggers>
                                        </Style>
                                    </StackPanel.Style>
                                    <TextBlock Text="{x:Static resx:Resources.ColorFilter}" Style="{StaticResource CategoryTitle}"/>
                                    <telerik:RadComboBox ItemsSource="{Binding ColorFilter}" SelectedIndex="0" SelectedItem="{Binding CurrentColorFilter, Mode=TwoWay}" Width="300" HorizontalAlignment="Left"/>
                                </StackPanel>

                                <telerik:RadButton Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" Margin="20 10"
                                           Command="{Binding UpdateColorsSapce}" Content="{x:Static resx:Resources.UpdateColorsSpace}"/>

                            </Grid>
                        </telerik:RadPane>
                        <telerik:RadPane Title="HiddenPane" IsPinned="False" telerik:RadDocking.SerializationTag="HiddenPane"
                                         Visibility="Hidden" Width="40" Height="0" Margin="0"/>
                    </telerik:RadPaneGroup>
                </telerik:RadSplitContainer>
            </telerik:RadDocking>
        </DockPanel>
        <StackPanel x:Name="ButtonsPanel" Width="50" HorizontalAlignment="Left" VerticalAlignment="Bottom">
            <telerik:RadToggleButton ToolTip="{x:Static resx:Resources.Viewer}" Margin="5 2"
                                     IsChecked="{Binding Path=IsViewerDisplayed, Mode=OneWay}"
                                     Command="{Binding Path=ShowOrCloseViewerCommand}">
                <Image Source="/icons/viewer.png" Style="{StaticResource HeaderImg}"/>
            </telerik:RadToggleButton>
            <telerik:RadButton ToolTip="{x:Static resx:Resources.AcquireImages}" Command="{Binding AcquireImages}"
                               Margin="5 2" Padding="5" >
                <Image Source="/icons/acquireImg.png" Style="{StaticResource HeaderImg}"/>
            </telerik:RadButton>
            <telerik:RadToggleButton ToolTip="{Binding AcquireVideoLabel}" Command="{Binding AcquireVideo}" 
                                     IsChecked="{Binding IsAcquiringVideo, Mode=OneWayToSource}" Margin="5 2">
                <Image Source="/icons/acquireVideo.png" Style="{StaticResource HeaderImg}"/>
            </telerik:RadToggleButton>
        </StackPanel>
    </Grid>
</UserControl>
    


In Development
Last Updated: 13 Dec 2019 08:20 by ADMIN
The compass elements are not on the proper places when the docking is on the second monitor. To reproduce this the DPI of the monitors should be different for example 125% (main) and 150% (secondary). Also, to reproduce this you will need to enable the DPI awareness of the application by setting the dpiAware and dpiAwareness settings in the app.manifest file.
Approved
Last Updated: 06 Dec 2019 15:18 by ADMIN
ToolWindow does not respect the "Show window contents while dragging" setting when it is first floated.
Approved
Last Updated: 03 Dec 2019 14:47 by ADMIN
Prevent the closing of the auto-hide area if the context menu of an element in it is opened.
Approved
Last Updated: 01 Nov 2019 09:21 by ADMIN

This feature request is related to Ticket 1435779

 

Image for context

 

Currently, there's no support for increasing the drag threshold for the items on the orange box. Even after setting the values below.

DragDropManager.MinimumHorizontalDragDistance = 5000;
DragDropManager.MinimumVerticalDragDistance = 5000;

 

It would also be beneficial if instead of just relying on the drag threshold which is the box. Add a support for a sort of "Drag Time" concept where we can define how long the user should've held the actual pane before dragging/going outside the threshold.

Completed
Last Updated: 30 Oct 2019 07:49 by ADMIN
Release LIB 2019.3.1103
Approved
Last Updated: 28 Oct 2019 16:31 by ADMIN
Completed
Last Updated: 21 Oct 2019 10:53 by ADMIN
Release R3 2019 SP1

Hello Support,

we are using the RadDocking.LayoutChangeEnded event to store the docking layout (via RadDocking.SaveLayout) after the user has changed it.

When animations are enabled (default) everything works as expected and all groups, split containers, and panes are included when in the XML written by RadDocking.SaveLayout.

However, when disabling animations (either using AnimationManager.IsGlobalAnimationEnabled or custom styles for RadWindow and/or ToolWindow setting AnimationManager.IsAnimationEnabled to false) the RadDocking.LayoutChangeEnded event is raised too early.

The faulty behavior can be reproduced with the attached demo application as follows:

1. start the application (App.xaml includes a style for ToolWindow with animations disabled)

2. drag the pane "Solution Explorer" out of the application to create a new tool window

3. drag the "Solution Explorer" tool window onto the "Properties" pane's compass and drop it below "Properties", so that "Properties" and "Solution Explorer" are both pinned right in the application above each other

4. when inspecting the layout written to the "Output" pane you will find that the entry for the RadPane "Solution Explorer" is missing

Any additional change to the docking layout (like resizing a pane) will update the layout and show all panes again.

When enabling animations in the ToolWindow style the above steps will result in the complete layout being written to the "Output" pane.

Please let me know should you require further information for reproduction of this bug.

Best regards,

Oliver

Completed
Last Updated: 04 Oct 2019 10:28 by ADMIN
Release LIB 2019.3.1007
The CustomElementLoading event can't be canceled without creating a new instance of the custom element.

As a workaround in the CustomElementLoading event handler you can call the SetAffectedElement() with creating DependencyObject and then Cancel the event by setting the Cancel property.
private void RadDockingOnCustomElementLoading(object sender, LayoutSerializationCustomLoadingEventArgs e)
{
    if (e.CustomElementTypeName == "MyRadPane")
    {
        e.SetAffectedElement(new DependencyObject());
        e.Cancel = true;              
    }
}
Approved
Last Updated: 07 Jun 2019 10:52 by ADMIN

Description:

When using a display with scaling setting to more than 100%, floating pane docking does not work as intended. When dragging a pane out of a PaneGroup, and without releasing it, you drop it on top of another tab (so it is inserted into that position in the PaneGroup), nothing happens (window stays floating in that position). If you drag the already floating window on top of the same tab, then the default behavior happens and the pane is docked into the group. This behavior is reproducible on the Telerik UI for WPF Demo app.

See attached video for reproduction case in Demo app.

 

Technical Details:

For the failing scenario DragDelta on the ToolWindow is being triggered with wrongly scaled mouse position. On second drag drop operation, DragDelta receives properly scaled mouse position.

Failure case mouse positions:

DRAG START {864,128.8}
DRAG DELTA {871.2,142.4}
...
DRAG DELTA {864.8,114.4}
DRAG END {1081,143}

Second case mouse positions:

DRAG START {862.4,116}
DRAG DELTA {873.6,160.8}
...
DRAG DELTA {860.8,112}
DRAG END {860.8,112}
Completed
Last Updated: 03 Jun 2019 06:26 by ADMIN
Release LIB 2019.2.603 (06/03/2019)
When the IsHidden property of a RadPane within a ToolWindow is set to True and then to false in quick succession, the ToolWindow is not shown. 

As a workaround, you can disable the animation of the ToolWindow:
<Style TargetType="telerik:ToolWindow">
<Setter Property="telerik:AnimationManager.IsAnimationEnabled" Value="False" />
</Style>

The above style need to be placed in the resources of the App.xaml in order to take effect on the ToolWindows, since they are displayed in a separated visual tree.
Approved
Last Updated: 07 May 2019 10:20 by ADMIN
Possible work-around of this problem:

private void RadDocking_ElementLoaded ( object sender, LayoutSerializationEventArgs e )
 {
     if ( e.AffectedElement is RadPaneGroup )
     {
         var PaneGroup = e.AffectedElement as RadPaneGroup;
         var Panes = PaneGroup.EnumeratePanes().ToList();
         var SelectedIndex = PaneGroup.SelectedIndex;

         for ( int Index = 0; Index < Panes.Count; Index++ )
         {
             if ( ( Panes[ Index ].IsHidden || !Panes[ Index ].IsPinned ) && Index <= SelectedIndex )
             {
                 SelectedIndex++;
             }
         }

         PaneGroup.SelectedIndex = SelectedIndex;
     }
 }
Completed
Last Updated: 19 Apr 2019 14:05 by ADMIN
Release LIB 2019.1.422 (04/22/2019)
The exception is reproduced when multiple toolwindows with nested owners are floated and they are reloaded by re-merging the dictionaries in App.xaml in a NoXaml scenario.
Completed
Last Updated: 19 Apr 2019 12:58 by ADMIN
Release LIB 2019.1.422 (04/22/2019)

Dynamically adding RadPane to PaneGroup, the header of the pane does not appear on the second added pane.

To workaround this the OnApplyTemplate() method can be called after the RadPane is added to the RadPaneGroup.

Completed
Last Updated: 16 Apr 2019 08:16 by ADMIN
Release LIB 2019.1.422 (04/22/2019)
Approved
Last Updated: 09 Apr 2019 07:07 by ADMIN
This issue is replicable in a setup which has two monitors and wit different DPI.
If a docking window is resized to a width over both monitors, when the window is more than a half on the monitor with lower DPI, it is not possible to dock it.
Declined
Last Updated: 22 Mar 2019 12:48 by ADMIN
Created by: Marco
Comments: 2
Category: Docking
Type: Feature Request
1

Having Problems with unreadable Tabs in RadPaneGroup: TabsSqueeze.png

I think I found a Solution with OverflowMode and ScrollViewer:

<telerik:RadPaneGroup x:Name="DocumentGroup" ScrollViewer.HorizontalScrollBarVisibility="Auto" OverflowMode="Scroll">

Problem:

After Loading Layout the OverflowMode is not respected anymore.

I found this ticket in Silverlight, what discribes the Problem and is approved: Docking: I would like OverflowMode to work for all RadPaneGroup in xaml/codebehind and this be persisted through SaveLayout/LoadLayout

And i found this documentation, which say, using OverflowMode can lead to unexpected behaviors:
https://docs.telerik.com/devtools/wpf/controls/raddocking/general-information/not-supported-properties

so i report this as a feature instead of a bug.

Please sea atteched an example project: TabWrapProblem.zip
Usage: Save and than Load the Layout -> Scrolling of tabs break

Approved
Last Updated: 15 Mar 2019 17:39 by ADMIN
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