SelectionChanged on ComboBoxColumn

[Hans Peter]

Hi,

im using a TreeListView and would like to get an event, when the selection in a ComboboxColumn changes. I can't find any event helping me. Here is my XAML:

		<telerik:RadTreeListView Name="rtlvQuery" Grid.Column="0" Grid.Row="0" IsDragDropEnabled="true" Margin="30" AutoGenerateColumns="False" >
			<telerik:RadTreeListView.ChildTableDefinitions>
				<telerik:TreeListViewTableDefinition ItemsSource="{Binding Filters}" />
			</telerik:RadTreeListView.ChildTableDefinitions>
			<telerik:RadTreeListView.Columns>
				<telerik:GridViewDataColumn DataMemberBinding="{Binding IsActive}" Header="Active" />
				<telerik:GridViewDataColumn DataMemberBinding="{Binding Name}" Header="Name" />
				<telerik:GridViewDataColumn DataMemberBinding="{Binding Description}" Header="Description"/>
				<telerik:GridViewComboBoxColumn ItemsSourceBinding="{Binding AvailableFilterTypes}" DataMemberBinding="{Binding FilterType}"  
												Header="Type" SelectedValueMemberPath="Value"  DisplayMemberPath="DisplayName" />
				<telerik:GridViewDataColumn DataMemberBinding="{Binding IsNegated}" Header="Negate"/>
 
			</telerik:RadTreeListView.Columns>
		</telerik:RadTreeListView>

I use a ItemSourceBinding because the available Combobox is bound to a filtered List of EnumMemberViewModel build by EnumDataSource.FromType<FilterType>( );

I tried the following, that I found in the forum for RadGridView, but thta doesn't seem to work in TLV:

		<Grid.Resources>
			<Style TargetType="telerik:RadComboBox" >
				<EventSetter Event="SelectionChanged" Handler="ComboBox_SelectionChanged" />
			</Style>
		</Grid.Resources>

Any idea, how I could solve this?

Thanks
Hans

[Milan]

Hello Hans Peter,

Could you please elaborate of your need to listed for SelectionChange. There might be a more elegant way to achieve the desired result.

Greetings,
Milan
the Telerik team

[Hans Peter]

Hi Milan,

thanks for the answer. I have a TLV were the nodes are part of a userdefined query composed with AND and OR groups. I'm looking for a solution, where the user can change the type from a group from OR to AND and otherwise. So I bound an enum to the combobox column. When the group is changed, some other things have to be updated. So I need an event, when the user changes the value. Now I'm using a CellTemplate, but that is for shure not the elegant way. It would be great, if you could add such an event to the GridViewComboBoxColumn.

Greetings,
Hans Peter

[Pavel Pavlov]

Hi Hans Peter,

One of the ways to sense changes in the selected value in a combo inside RadGridView is described in
point 3 of this blogpost.

There is some code illustrating how to subscribe to the selection changed event of a combo inside RadGridView.

All the best,
Pavel Pavlov
the Telerik team