Progress® Telerik® UI for WPF Feedback Portal

Unplanned

Last Updated: 21 Mar 2025 13:05 by Stenly

ComboBox: Selecting an item from a RadComboBox in a touch scenario causes RadComboBox below the item to open

Created by: Stenly

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox: Selecting an item from a RadComboBox in a touch scenario causes RadComboBox below the item to open

In a touch scenario, when there are RadComboBox instances one below the other, selecting an item from a RadComboBox opens the RadComboBox instance, which is below the selected item.

This is present when there is a global Style that targets the native WPF ScrollViewer element, which sets its PanningMode property to Both.

To work this around, set the TouchManager.TouchMode to HitTestHidden, in order to exclude the RadComboBox from the TouchManager's events propagation.

Unplanned

Last Updated: 19 Mar 2025 15:11 by Martin Ivanov

ComboBox: ArgumentOutOfRangeException on ItemsSource reset when AllowMultipleSelection is True

Created by: Martin Ivanov

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox: ArgumentOutOfRangeException on ItemsSource reset when AllowMultipleSelection is True

ArgumentOutOfRangeException occurs when the ItemsSource of RadComboBox gets reset. To recreate this the IsSelected property of RadComboBoxItem should be bound too and multiple selection should be allowed.

To work this around, you can disable the autiomation peers globally:

AutomationManager.AutomationMode = AutomationMode.Disabled;

Or you disable them only for the RadComboBox:

public class CustomComboBox : RadComboBox
{
    protected override AutomationPeer OnCreateAutomationPeer()
    {
        return null;
    }
}

The stacktrace:

System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')'
  System.Private.CoreLib.dll!System.ThrowHelper.ThrowArgumentOutOfRange_IndexMustBeLessException() Unknown
  System.Private.CoreLib.dll!System.Collections.Generic.List<System.__Canon>.this[int].get(int index) Unknown  Telerik.Windows.Controls.Input.dll!Telerik.Windows.Automation.Peers.RadComboBoxAutomationPeer.RaiseSelectionEvents(System.Windows.Controls.SelectionChangedEventArgs e) Line 202 C#  Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.RadComboBox.OnSelectionChanged(System.Windows.Controls.SelectionChangedEventArgs e) Line 1927 C#
  PresentationFramework.dll!System.Windows.Controls.Primitives.Selector.SetSelectedHelper(object item, System.Windows.FrameworkElement UI, bool selected) Unknown
  PresentationFramework.dll!System.Windows.Controls.Primitives.Selector.NotifyIsSelectedChanged(System.Windows.FrameworkElement container, bool selected, System.Windows.RoutedEventArgs e) Unknown
  PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source, System.Windows.RoutedEventArgs args, bool reRaised) Unknown
  PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender, System.Windows.RoutedEventArgs args) Unknown
  Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.RadComboBoxItem.OnSelected(System.Windows.RoutedEventArgs e) Line 59 C#
  PresentationFramework.dll!System.Windows.Controls.ListBoxItem.OnIsSelectedChanged(System.Windows.DependencyObject d, System.Windows.DependencyPropertyChangedEventArgs e) Unknown
  PresentationFramework.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs args) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex entryIndex, System.Windows.DependencyProperty dp, System.Windows.PropertyMetadata metadata, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry, bool coerceWithDeferredReference, bool coerceWithCurrentValue, System.Windows.OperationType operationType) Unknown
  PresentationFramework.dll!System.Windows.StyleHelper.ApplyStyleOrTemplateValue(MS.Internal.FrameworkObject fo, System.Windows.DependencyProperty dp) Unknown
  PresentationFramework.dll!System.Windows.StyleHelper.InvalidateContainerDependents(System.Windows.DependencyObject container, ref MS.Utility.FrugalStructList<System.Windows.ContainerDependent> exclusionContainerDependents, ref MS.Utility.FrugalStructList<System.Windows.ContainerDependent> oldContainerDependents, ref MS.Utility.FrugalStructList<System.Windows.ContainerDependent> newContainerDependents) Unknown
  PresentationFramework.dll!System.Windows.StyleHelper.DoStyleInvalidations(System.Windows.FrameworkElement fe, System.Windows.FrameworkContentElement fce, System.Windows.Style oldStyle, System.Windows.Style newStyle) Unknown
  PresentationFramework.dll!System.Windows.StyleHelper.UpdateStyleCache(System.Windows.FrameworkElement fe, System.Windows.FrameworkContentElement fce, System.Windows.Style oldStyle, System.Windows.Style newStyle, ref System.Windows.Style styleCache) Unknown
  PresentationFramework.dll!System.Windows.FrameworkElement.OnStyleChanged(System.Windows.DependencyObject d, System.Windows.DependencyPropertyChangedEventArgs e) Unknown
  PresentationFramework.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs args) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex entryIndex, System.Windows.DependencyProperty dp, System.Windows.PropertyMetadata metadata, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry, bool coerceWithDeferredReference, bool coerceWithCurrentValue, System.Windows.OperationType operationType) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.InvalidateProperty(System.Windows.DependencyProperty dp, bool preserveCurrentValue) Unknown
  PresentationFramework.dll!System.Windows.FrameworkElement.UpdateStyleProperty() Unknown
  PresentationFramework.dll!System.Windows.FrameworkElement.OnInitialized(System.EventArgs e) Unknown
  Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.RadComboBoxItem.OnInitialized(System.EventArgs e) Line 106 C#
  PresentationFramework.dll!System.Windows.FrameworkElement.OnVisualParentChanged(System.Windows.DependencyObject oldParent) Unknown
  PresentationFramework.dll!System.Windows.Controls.ListBoxItem.OnVisualParentChanged(System.Windows.DependencyObject oldParent) Unknown
  PresentationCore.dll!System.Windows.Media.Visual.FireOnVisualParentChanged(System.Windows.DependencyObject oldParent) Unknown
  PresentationCore.dll!System.Windows.Media.Visual.AddVisualChild(System.Windows.Media.Visual child) Unknown
  PresentationCore.dll!System.Windows.Media.VisualCollection.Add(System.Windows.Media.Visual visual) Unknown
  PresentationFramework.dll!System.Windows.Controls.UIElementCollection.AddInternal(System.Windows.UIElement element) Unknown
  PresentationFramework.dll!System.Windows.Controls.Panel.GenerateChildren() Unknown
  PresentationFramework.dll!System.Windows.Controls.Panel.OnItemsChangedInternal(object sender, System.Windows.Controls.Primitives.ItemsChangedEventArgs args) Unknown
  PresentationFramework.dll!System.Windows.Controls.Panel.OnItemsChanged(object sender, System.Windows.Controls.Primitives.ItemsChangedEventArgs args) Unknown
  PresentationFramework.dll!System.Windows.Controls.ItemContainerGenerator.OnRefresh() Unknown
  PresentationFramework.dll!System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Unknown
  WindowsBase.dll!System.Windows.WeakEventManager.ListenerList<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.DeliverEvent(object sender, System.EventArgs e, System.Type managerType) Unknown
  WindowsBase.dll!System.Windows.WeakEventManager.DeliverEvent(object sender, System.EventArgs args) Unknown
  PresentationFramework.dll!System.Windows.Data.CollectionView.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Unknown
  WindowsBase.dll!System.Windows.WeakEventManager.ListenerList<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.DeliverEvent(object sender, System.EventArgs e, System.Type managerType) Unknown
  WindowsBase.dll!System.Windows.WeakEventManager.DeliverEvent(object sender, System.EventArgs args) Unknown
  PresentationFramework.dll!System.Windows.Data.CollectionView.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Unknown
  PresentationFramework.dll!System.Windows.Data.ListCollectionView.RefreshOverride() Unknown
  PresentationFramework.dll!System.Windows.Data.CollectionView.RefreshInternal() Unknown
  PresentationFramework.dll!System.Windows.Data.CollectionView.DeferHelper.Dispose() Unknown
  PresentationFramework.dll!System.Windows.Controls.ItemCollection.SetCollectionView(System.Windows.Data.CollectionView view) Unknown
  PresentationFramework.dll!System.Windows.Controls.ItemsControl.OnItemsSourceChanged(System.Windows.DependencyObject d, System.Windows.DependencyPropertyChangedEventArgs e) Unknown
  PresentationFramework.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs args) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex entryIndex, System.Windows.DependencyProperty dp, System.Windows.PropertyMetadata metadata, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry, bool coerceWithDeferredReference, bool coerceWithCurrentValue, System.Windows.OperationType operationType) Unknown
  WindowsBase.dll!System.Windows.DependencyObject.InvalidateProperty(System.Windows.DependencyProperty dp, bool preserveCurrentValue) Unknown
  PresentationFramework.dll!System.Windows.Data.BindingExpression.TransferValue(object newValue, bool isASubPropertyChange) Unknown
  PresentationFramework.dll!MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(int k, System.ComponentModel.ICollectionView collectionView, object newValue, bool isASubPropertyChange) Unknown
  PresentationFramework.dll!MS.Internal.Data.ClrBindingWorker.OnSourcePropertyChanged(object o, string propName) Unknown
  WindowsBase.dll!System.Windows.WeakEventManager.ListenerList<System.ComponentModel.PropertyChangedEventArgs>.DeliverEvent(object sender, System.EventArgs e, System.Type managerType) Unknown
  WindowsBase.dll!System.ComponentModel.PropertyChangedEventManager.OnPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs args) Unknown
  Telerik.Windows.Controls.dll!Telerik.Windows.Controls.ViewModelBase.OnPropertyChanged(string propertyName) Unknown
> WpfApp180.dll!WpfApp180.MainViewModel.ResetData() Line 44 C#

Unplanned

Last Updated: 06 Mar 2025 10:02 by Martin Ivanov

ComboBox: Add a filter search box in the drop down element

Created by: Martin Ivanov

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Add a filter search box in the drop down element

Currently RadComboBox supports filtering of the data when IsEditable is True.

Add a mode where a search box is displayed (when IsEditable is False) in the drop down of the control. The searchbox should filter the items in the dropdown.

Unplanned

Last Updated: 24 Dec 2024 09:38 by Stenly

ComboBox: Add Extended selection option

Created by: Stenly

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Add Extended selection option

Currently, the RadComboBox provides support for single or multiple selections. We can add an Extended selection mode similar to the one present in the RadListBox control.

Unplanned

Last Updated: 28 Nov 2024 15:01 by Scott Waye

ADMIN

ComboBox: Make possible to virtualization with filtering

Created by: Kalin

Comments: 4

Category: ComboBox

Type: Feature Request

ComboBox: Make possible to virtualization with filtering

Currently filtering with virtualized RadComboBox is not supported as the filtering feature works with the containers (changes their Visibility).

Unplanned

Last Updated: 08 Apr 2024 10:23 by Stenly

ComboBox: Add NoResultsContent and NoResultsContentTemplate properties

Created by: Stenly

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Add NoResultsContent and NoResultsContentTemplate properties

Add NoResultsContent and NoResultsContentTemplate properties to the RadComboBox control.

Unplanned

Last Updated: 19 Sep 2023 15:20 by Martin Ivanov

ComboBox: Add the option to include additional content in the drop down area

Created by: Martin Ivanov

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Add the option to include additional content in the drop down area

Currently, the drop down of RadComboBox contains only the RadComboBoxItems and the Clear Selection button. Add new content presenter that allows you to include extra visuals, like buttons or text.

The feature is similar to the AdditionalContent of RadTabControl.

Unplanned

Last Updated: 04 Aug 2021 09:29 by ADMIN

ComboBox: Add SelectAll button or template

Created by: Dinko

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Add SelectAll button or template

The RadComboBox control could provide SelectAll button or template functionality. This way the user can choose whether to use the default button or create a custom select all behavior.

Unplanned

Last Updated: 30 Jul 2021 00:53 by Kun

ComboBox: Improve selection while the control is populated with equal string values in Single selection mode

Created by: Dinko

Comments: 1

Category: ComboBox

Type: Bug Report

ComboBox: Improve selection while the control is populated with equal string values in Single selection mode

In this case, the control is bound to a collection of strings. The collection contains equal string values. ("h1","h2","h1"). When the first item is selected and afterward we select the last one, will not trigger the SelectionChanged event. This behavior could be improved.

Unplanned

Last Updated: 02 Feb 2021 11:02 by ADMIN

ComboBox: Provide a way to disable the selection of the first item when searching is performed

Created by: Christian

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Provide a way to disable the selection of the first item when searching is performed

Currently, the first filtered item of the control is selected once a search (with IsTextSearchEnabled=True) is performed. Users should be able to control whether this happens or if the selection needs to be skipped.

Unplanned

Last Updated: 27 Dec 2019 12:36 by ADMIN

ComboBox: Allow customizing the element that shows the EmptyText

Created by: Martin Ivanov

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Allow customizing the element that shows the EmptyText

Currently, the EmptyText is shown in a TextBlock which cannot be customized. Add a EmptyTextContent or EmptyTextVisualStyle properties to allow customizing the UI of the empty text.

Unplanned

Last Updated: 18 Feb 2019 15:43 by ADMIN

ComboBox: Add SelectedItemsSource MVVM support

Created by: iSlide

Comments: 1

Category: ComboBox

Type: Feature Request

ComboBox: Add SelectedItemsSource MVVM support

The RadListBox has an attached property for mvvm binding of SelectedItems - https://docs.telerik.com/devtools/wpf/controls/radlistbox/features/selecteditemssource.

Please support SelectedItemsSource for RadComboxBox too.

Unplanned

Last Updated: 05 Jul 2018 10:23 by ADMIN

ADMIN

ComboBox: When placed inside RadRibbonBackstageItem the drop-down is not closed when the Window is deactivated using Alt+Tab

Created by: Dinko | Tech Support Engineer

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox: When placed inside RadRibbonBackstageItem the drop-down is not closed when the Window is deactivated using Alt+Tab

Unplanned

Last Updated: 09 May 2018 10:59 by ADMIN

ADMIN

ComboBox: Enable autocomplete functionality when filtering behavior is used

Created by: Dilyan Traykov

Comments: 0

Category: ComboBox

Type: Feature Request

ComboBox: Enable autocomplete functionality when filtering behavior is used

Unplanned

Last Updated: 19 Jan 2018 13:53 by ADMIN

ADMIN

ComboBox with static items (defined in xaml) that are of type ContentControl does not select them correctly

Created by: Dinko | Tech Support Engineer

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox with static items (defined in xaml) that are of type ContentControl does not select them correctly

Unplanned

Last Updated: 07 Feb 2017 09:40 by ADMIN

ADMIN

ComboBox: The Text property is not updated to the correct autocompleted item when the input Text is set outside of the control

Created by: Nasko

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox: The Text property is not updated to the correct autocompleted item when the input Text is set outside of the control

Unplanned

Last Updated: 03 Jan 2017 21:17 by ADMIN

ADMIN

ComboBox: If RadComboBox is placed in RadTileView the dropdown popup of the control doesn't close when changing between Tiles.

Created by: Telerik Admin

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox: If RadComboBox is placed in RadTileView the dropdown popup of the control doesn't close when changing between Tiles.

Unplanned

Last Updated: 03 Jan 2017 21:07 by ADMIN

ADMIN

ComboBox: The OnLostFocus event handler is triggered incorrectly when the control is inherited and the OnLostFocus is overridden

Created by: Vladi

Comments: 0

Category: ComboBox

Type: Bug Report

ComboBox: The OnLostFocus event handler is triggered incorrectly when the control is inherited and the OnLostFocus is overridden

The OnLostFocus is triggered when the control gets the focus and is not triggered after the focus is lost. The current call stack is as follows:
- The control gets the focus 
- OnGotFocus is hit
- OnLostFocus is hit incorrectly
- The focus is removed from the control
- The OnLostFocus is not hit and it should be

As a workaround you can hook to these events in the constructor of the custom ComboBox:

    public MyRadComboBox()
    {
        this.GotFocus += MyRadComboBox_GotFocus;
        this.LostFocus += MyRadComboBox_LostFocus;
    }

Unplanned