Last Updated: 29 May 2020 13:10 by ADMIN
Created by: Sia
Comments: 0
Category: UI for WPF
Type: Bug Report
We distribute two types of themes solutions with our source code. The first one are: Themes.Sources.sln (for Silverlight), Themes.Sources_WPF.sln and Themes.Sources_NetCore.sln which are used to rebuild our themes. The second one are those without Source in their names, which are used to distribute the output files. Adding references there will remove the errors which appear.
Last Updated: 29 May 2020 13:00 by ADMIN
We can help our customers to achieve a different look of their applications by setting a custom palette.
Last Updated: 26 May 2020 16:16 by ADMIN

The check mark of the RadioButton is misaligned when DPI settings are set to a higher than the default value, e.g. 125%.

The problem can easily be reproduced using the Telerik UI for WPF Demo application:

Under Review
Last Updated: 26 May 2020 06:48 by Valentin
Created by: Valentin
Comments: 3
Category: UI for WPF
Type: Feature Request

It would be awesome if the user would be able to create folders for visual organization in tree views, tree list views and list views. These folders should not be actual items in the tree, but rather be a visual simplification for complex lists and trees.

Folder specific features:

  • Add, move, rename and delete folders
  • Add or move items to the folders (for example via drag&drop)
  • Move and delete folders with their content
  • Verification, if certain types are allowed in a folder
  • Sort the content of the folder

    View specific features

  • Switch between “folder view” and “folderless view”
  • Save and load structures, similar to the LayoutControl
  • Verification, if a folder is allowed to be moved to or created in certain areas
  • Possibility to manipulate the structure from the code

With this feature the user would find it easier to organize sometimes complex trees and lists into manageable folder structures, as the layout would be created by the user himself. The folders also make collective operations on items in them easier to handle, as the user can move or delete the folder with its content and does not need to select long lists of items for every operation. This would increase the usability of the trees and lists.

Last Updated: 15 May 2020 05:58 by ADMIN
Release R2 2020
Created by: Telerik Admin
Comments: 1
Category: UI for WPF
Type: Feature Request

Last Updated: 04 May 2020 07:17 by ADMIN
Release R2 2020
Created by: Telerik Admin
Comments: 5
Category: UI for WPF
Type: Feature Request
Last Updated: 24 Apr 2020 05:21 by ADMIN

Exception when editing the template and showing the tooltip of the ValidationErrorElement 


Replace the validation element: 

<Grid x:Name="ValidationErrorElement" Visibility="Collapsed">
        <ToolTip x:Name="PART_ToolTip" Placement="Right" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                <ControlTemplate TargetType="{x:Type ToolTip}">
                    <Grid x:Name="RootVisual" HorizontalAlignment="Right" Margin="5,0" Opacity="0" RenderTransformOrigin="0,0">
                            <TranslateTransform X="-25" x:Name="xform"/>
                            <VisualStateGroup x:Name="OpenStates">
                                    <VisualTransition From="{x:Null}" GeneratedDuration="0" GeneratedEasingFunction="{x:Null}" Storyboard="{x:Null}" To="{x:Null}"/>
                                    <VisualTransition From="{x:Null}" GeneratedDuration="0:0:0.2" GeneratedEasingFunction="{x:Null}" To="Open">
                                            <DoubleAnimation Duration="0:0:0.2" To="0" Storyboard.TargetProperty="X" Storyboard.TargetName="xform">
                                                    <BackEase Amplitude="0.3" EasingMode="EaseOut"/>
                                            <DoubleAnimation Duration="0:0:0.2" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="RootVisual"/>
                                <VisualState x:Name="Closed">
                                        <DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="RootVisual"/>
                                <VisualState x:Name="Open">
                                        <DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="X" Storyboard.TargetName="xform"/>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="RootVisual"/>
                            <Path Data="M4,0L0,4 4,8z" Fill="#FFDC000C" HorizontalAlignment="Left" Height="10" Stretch="None" VerticalAlignment="Top" Width="6"/>
                            <Border Background="#FFDC000C" Margin="4,0,0,0" Padding="1">
                                <TextBlock Foreground="White" MaxWidth="250" Margin="8,4" TextWrapping="Wrap" Text="{Binding ValidationErrors[0].ErrorContent}"/>
    <Border Background="Transparent" HorizontalAlignment="Right" Height="9" VerticalAlignment="Top" Width="9"/>
    <Border BorderBrush="#FFDC000C" BorderThickness="1" CornerRadius="1"/>
    <Path Data="M0,2L5,2 5,7z" Fill="#FFDC000C" HorizontalAlignment="Right" Height="7" VerticalAlignment="Top" Width="7"/>
Last Updated: 21 Apr 2020 10:49 by ADMIN
The delay is observed when the project already references one of our WPF NuGet and you open the NuGet window to add more NuGets.
Last Updated: 20 Apr 2020 16:01 by ADMIN

When the StyleManager is applied to the control, the IsRippleEnabled property is not respected.

Last Updated: 08 Apr 2020 06:54 by ADMIN
Created by: wu
Comments: 2
Category: UI for WPF
Type: Bug Report

Testing in the RadColorEditor control:
   looking the attachments,Select the two numbers on the left(the file "Select.png"),
then enter a number through the keyboard,just modified the number on the far left(the file "Input1.png").
But sometimes the two numbers that are selected are replaced,like the file "Input2.png".
Obviously the second case input experience is better!
Continuous restarts cause one of the two.

Last Updated: 03 Apr 2020 13:05 by ADMIN
Release R2 2020
NuGet: A wrong dependency is added when installing the SpreadsheetStreamingExport package.
Last Updated: 03 Apr 2020 12:11 by ADMIN

Hi All,

I would like to hide the mouse over background to TreeListViewRow, and now the solution that I know is to edit the template my self.

Is it possible to add custom value for MouseOverBackground, SelectedBackground like GridViewRowStyle?


Thanks in advance for you feedback.

Last Updated: 24 Mar 2020 15:26 by ADMIN
The image quality is changed when pasting an image. 
Pending Review
Last Updated: 16 Mar 2020 08:34 by ADMIN
Created by: Olivier
Comments: 1
Category: UI for WPF
Type: Feature Request


We want to integrate a web browser in a flyout pane in WPF to display html 5 pages. Moreover, we want to display some html contents in tooltips too.

The provided WebBrowser by WPF framework does not work well.

Consequently, the idea is to have a "htmlplaceholder" (as you provide in silverlight) which supports HTML 5 and could be based on chromium engine.

Thanks & regards,


Last Updated: 05 Mar 2020 21:17 by ADMIN
Created by: wu
Comments: 2
Category: UI for WPF
Type: Bug Report
look the attachment,when move the float window over the top Compass,and just there is a document tab under the Compass,
the place preview will flash.
Last Updated: 28 Feb 2020 13:24 by ADMIN
Created by: Mi
Comments: 8
Category: UI for WPF
Type: Feature Request

As we now have support for Webcams with RadWebcam-Control how about supporting Twain? But not the old version, instead the platform independent newer Twain-Direct. There is already C# Source Code under MIT-License available: https://github.com/twain/twain-direct. I think this could be used in Xamarin and WinForms, even ASP.NET also...

Last Updated: 14 Feb 2020 14:13 by ADMIN
Release R1 2020 SP1

In the Crystal theme the ScrollBars are narrow and expand their size when the mouse is over. Introduce property that sets the default appearance of ScrollViewer's ScrollBars, similar to the ScrollBarMode property for the Fluent theme, which has the following options for the ScrollBar size:

  • Auto - narrow & expands to normal size
  • Compact - always narrow
  • Normal - always normal size
Last Updated: 12 Feb 2020 15:35 by ADMIN

The application can be ported to .NET Core, uploaded to the Windows store and potentially have its source code distributed.

Last Updated: 10 Feb 2020 13:19 by ADMIN

using GroupStyle ,and setting : ScrollViewer.CanContentScroll="False",when click the item,
within the group,the ScrollViewer auto scroll up and down,don't using VirtualizingPanel.
but the microsoft ListBox is OK!

 the code like the follwoing:
    <telerik:RadListBox Width="250" ItemsSource="{Binding Data.View}" SelectionMode="Single"
                            ItemTemplate="{StaticResource ListBoxTemplate}"
                            <Style TargetType="{x:Type GroupItem}">
                                <Setter Property="Template">
                                        <ControlTemplate TargetType="{x:Type GroupItem}">
                                            <Expander IsExpanded="True"
                                                    <StackPanel Orientation="Horizontal">
                                                        <TextBlock Text="{Binding Path=Name}"
                                                        VerticalAlignment="Center" />
                                                        <TextBlock Text="{Binding Path=ItemCount, StringFormat=Count:{0}}"
                                                        Margin="5,0,0,0" />
                                                <ItemsPresenter />

Last Updated: 10 Feb 2020 09:21 by ADMIN
Created by: wu
Comments: 2
Category: UI for WPF
Type: Bug Report
In Diagram simplified Ribbon view,can't select ellipse,path tool,and so on ,
the same time:the pointer tool/Text tool/Shape tool can't select exclusive,don't draw using the selected tool.
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