In Development
Last Updated: 19 May 2022 13:25 by ADMIN

When the SelectionMode of MultiColumnComboBox is set to Single, changing the Selection invokes twice the SelectionChanged event.

What I would expect is that the event fires only once, with one item in AddedItems and one item in RemovedItems. Currently, addition and removal is done seperately, and the two invocations of the event correspond to them.

To reproduce, just use the Getting Started article about MultiColumnComboBox with the Clubs ItemSource. Subscribe to SelectionChanged event and make a change to the selection. I hope the following gif makes this clear - the first selection is valid, but the second should invoke the event only once, with 1 item added, 1 removed.

Last Updated: 07 Jan 2022 07:09 by ADMIN
Release R1 2022

The drop-down menu does not close when a context menu is opened on top of it, even if the KeepDropDownOpen="False". The control would need to move the focus in order for the drop-down to close.

To work this around, you can use the CloseDropDown() method of the MultiColumnComboBox control.

Last Updated: 20 Sep 2021 07:04 by ADMIN
Release LIB 2021.3.920 (20 Sep 2021)
The search text gets cleared when a click on the combobox occurs (to open a combobox). No selection is performed during this action.

To work this around, you can cache the search text just before it is cleared and then restore it after the selection is performed.
Last Updated: 02 Aug 2021 08:02 by ADMIN
Release LIB 2021.2.802 (2 Aug 2021)

When placing controls in the CellTemplate/CellEditTemplate in the RadMultiColumnComboBox`s dropdown`s GridView some do not receive/accept the mouse input correctly.

In the newest version (2021.2.615) the dropdown of a RadDatePicker does not open. A RadButton works fine and a RadComboBox open and can select an item via mouse click.

In a previous version (2021.1.325) the RadComboBox also does not work, this seems to be fixed already.


I have attached a sample project demonstrating the behavio:

1) start the project

2) open the dropdown of the RadMultiColumnComboBox

3) click on the RadDatePicker`s calender icon button. => the calender view does not open

The very same DataTemplate is applied obove the RadMultiColumnComboBox to illustrate the proper behavior in contrast.


The behavior is visually demonstrated in the .gif (1.gif and 2.gif) I have attached.

Last Updated: 20 May 2021 07:14 by ADMIN
Release LIB 2021.2.525 (25/05/2021)

If you host RadMultiColumnComboBox in a control with a vertical ScrollViewer, then open the popup content of the RadMultiColumnComboBox and use the mouse wheel in it, the parent ScrollViewer scrolls. In comparison RadComboBox and the native WPF ComboBox are not scrolling. Instead the scrolling event is consumed and it doesn't propagate to the parent ScrollViewer.

The attached project shows one way to work this around.

Last Updated: 03 Mar 2021 11:12 by ADMIN
GridViewMultiColumnComboBoxColumn does not have any selected value in edit mode when SelectionBoxesVisibility is set to Collapsed/Hidden and AutoCompleteMode is Search/Suggest.
Last Updated: 26 Nov 2020 14:40 by ADMIN
Release R3 2020 SP1
Created by: Dinko
Comments: 0
Category: MultiColumnComboBox
Type: Feature Request
We can expose a way to select the text of the selected item when the MCCB is focused.
Last Updated: 04 Nov 2020 10:30 by ADMIN
When the SelectedBoxesVisiblity property is set to Collapsed and the SelectedItem is bound, no text appears in the control when an item is select.
Last Updated: 15 Oct 2020 14:30 by ADMIN
Release R3 2020 SP1
The received exception is: "System.ArgumentNullException: 'Value cannot be null.
Parameter name: source'".
Last Updated: 28 Sep 2020 09:54 by ADMIN
Release LIB 2020.3.928 (09/28/2020)
Selecting an item is not possible after the RadGridView control in the dropdown has been sorted.
Last Updated: 02 Sep 2020 10:54 by ADMIN
Release R3 2020
RadGridView columns expose a IsSearchable property that is not taken into account when you use RadMultiColumnComboBox and search via the autocomplete box. Add support for the property. If set to False, the searching should not find the corresponding column.
Last Updated: 31 Aug 2020 10:40 by ADMIN
Release LIB 2020.2.831
When the filtered items in the RadGridView do not contain the currently selected items, they are cleared. 
Last Updated: 28 Aug 2020 10:59 by ADMIN
Created by: Mats
Comments: 0
Category: MultiColumnComboBox
Type: Feature Request

Remove the possibility for one or more rows to be searched on.

In other words, it should not be possible to select disabled item rows by search.

Last Updated: 16 Jun 2020 12:59 by ADMIN
Release R2 2020 SP
Created by: Franz
Comments: 0
Category: MultiColumnComboBox
Type: Feature Request
The selection is lost when sorting or filtering is applied and the control is already filtered.
Last Updated: 05 Jun 2020 11:48 by ADMIN
Currently the search text is cleared after a selection is made in the RadMultiColumnComboBox. We can provide an option to avoid this and keep the entered text after the selection is made. 
Last Updated: 21 May 2020 08:28 by ADMIN
Release LIB 2020.2.526 (05/26/2020)

If you select an item in RadMultiColumnComboBox and then replace the ItemsSource of the GridViewItemsSourceProvider, the selection in the autocompletebox part of the the control is not cleared. There are items that are still selected and are not presented in the ItemsSource.

To work this around, you can create a custom GridViewItemsSourceProvider and override its OnPropertyChanged method. When the ItemsSource is changed, you can reset the selection.

public class CustomGridViewItemsSourceProvider : GridViewItemsSourceProvider
	public RadMultiColumnComboBox Owner
		get { return (RadMultiColumnComboBox)GetValue(OwnerProperty); }
		set { SetValue(OwnerProperty, value); }
	public static readonly DependencyProperty OwnerProperty =
			new PropertyMetadata(null));

	protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
		if (e.Property.Name == "ItemsSource" && this.Owner != null)

                <local:CustomGridViewItemsSourceProvider Owner="{Binding ElementName=mccb}" />

Last Updated: 10 Apr 2020 05:07 by ADMIN
Release LIB 2020.1.413 (04/13/2020)
InvalidOperationException is thrown when programmatically adding items to the SelectedItems collection after the dropdown has been opened.
Last Updated: 10 Feb 2020 16:26 by ADMIN
Release LIB 2020.1.210 (02/10/2020)

The following error is thrown when the dropdown of the control is opened: Cannot find governing FrameworkElement or FrameworkContentElement for target element. ... ; target element is 'GridViewItemsSourceProvider; target property is 'ItemsSource' (type 'Object')

If the combobox is placed inside a RadGridView, the error is thrown each time the dropdown is opened (after a commit action).

Last Updated: 10 Feb 2020 09:16 by ADMIN
Created by: Franz
Comments: 1
Category: MultiColumnComboBox
Type: Feature Request

It would be usefull to have a Property on the RadMultiColumnComboBox which represents the inputted searchtext. This Property should be TwoWay-Bindable.

A usecase for it could be to programmatically manipulate the searchtext.
For example setting it to NULL on LostFocus:

private void mccb_LostFocus(object sender, RoutedEventArgs e)
    this.mccb.ChildrenOfType<RadWatermarkTextBox>().First().Text = string.Empty;

Instead of hacking around with the visualTree etc. one could simply bind the property. This would also be MVVM compliant.

Proposed Name for the Property "SearchText".

Last Updated: 29 Jan 2020 15:02 by ADMIN
Release LIB 2020.1.203 (02/03/2020)

The Validation.ErrorTemplate attached property is not set. To workaround this, you can use the following resource.

<ControlTemplate x:Key="ValidationTooltipTemplate">
    <Grid SnapsToDevicePixels="True" VerticalAlignment="Top">
        <Border Background="Transparent" HorizontalAlignment="Right" VerticalAlignment="Top" Width="3" Height="3"/>
        <AdornedElementPlaceholder x:Name="Holder"/>
        <Border BorderBrush="{StaticResource ValidationTooltipOuterBorder}" BorderThickness="1" CornerRadius="{StaticResource ValidationTooltip_CornerRadius}"/>
        <Path Data="M2,1 L6,1 6,5 Z" Fill="{StaticResource ValidationInnerTick}" Width="7" Height="7" HorizontalAlignment="Right" VerticalAlignment="Top"/>
        <Path Data="M0,0 L2,0 7,5 7,7 Z" Fill="{StaticResource ValidationOuterTick}" Width="7" Height="7" HorizontalAlignment="Right" VerticalAlignment="Top"/>
            <ToolTip x:Name="PART_ToolTip"
                DataContext="{Binding RelativeSource={RelativeSource Mode=Self}, Path=PlacementTarget.DataContext}"
                Template="{StaticResource ErrorTooltipTemplate}"

<Style TargetType="telerik:RadMultiColumnComboBox" BasedOn="{StaticResource RadMultiColumnComboBoxStyle}">
    <Setter Property="Validation.ErrorTemplate" Value="{StaticResource ValidationTooltipTemplate}" />

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