MultiSelect ComboBox SelectionBoxTemplate binding issue

[Abdul]

To illustrate MultiSelectComboBox, I am using some forum posted code.

for comboBox i am using

 

<telerik:RadComboBox SelectedIndex="0" x:Name="MembersComboBox"
   ItemsSource="{Binding Members}"
   ItemTemplate="{StaticResource MultiSelectionComboBoxItemTemplate}"
   Visibility="{Binding CanViewOtherUserTrendingConfiguration}"
   SelectionBoxTemplate="{StaticResource MultiSelectionComboBoxSelectionBoxTemplate}"
   ToolTip="{Binding SelectedMembersText}"
   Width="150" Height="20" />

 as i am using MVVM pattern, above comboBox is contained in a user Control RadDocumentPane, and MainChartView userControl DataContext contains the ViewModel

<telerik:RadDocumentPane x:Class="MainChart.MainChartView"
...
>

 and datatemplate MultiSelectionComboBoxSelectionBoxTemplate is defined as

<DataTemplate x:Key="MultiSelectionComboBoxSelectionBoxTemplate">
 <TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type telerik:RadDocumentPane}, Mode=FindAncestor}, Path=DataContext.SelectedMembersText}" />
</DataTemplate>

 my question is when i check the checkboxes in the comboBox, it updates the tooltip of combo box, which is bind to viewModel's property SelectedMembersText, but it do not updates the textlbock inside the SelectionBoxTemplate. I am sure i am making some mistake in doing dataBinding. please help me fixing this issue, as i have already applied all possible ways(in my knowledge) of binding textBlock to the field.

 

 

 

 

 

 

 

 

 

1.<telerik:RadComboBox SelectedIndex="0" x:Name="MembersComboBox"                                    

2.                                     ItemsSource="{Binding Members}"

3.                                     ItemTemplate="{StaticResource MultiSelectionComboBoxItemTemplate}"

4.                                  

5.                                     Visibility="{Binding CanViewOtherUserTrendingConfiguration}"

6.                                     SelectionBoxTemplate="{StaticResource MultiSelectionComboBoxSelectionBoxTemplate}"

7.                                     ToolTip="{Binding SelectedMembersText}"

8.                                     Width="150" Height="20" />​

1.<telerik:RadComboBox SelectedIndex="0" x:Name="MembersComboBox"                                    

2.                                     ItemsSource="{Binding Members}"

3.                                     ItemTemplate="{StaticResource MultiSelectionComboBoxItemTemplate}"

4.                                  

5.                                     Visibility="{Binding CanViewOtherUserTrendingConfiguration}"

6.                                     SelectionBoxTemplate="{StaticResource MultiSelectionComboBoxSelectionBoxTemplate}"

7.                                     ToolTip="{Binding SelectedMembersText}"

8.                                     Width="150" Height="20" />​

[Abdul]

i am using code from this post

[Kalin]

Hi Abdul,

I already replied on the support ticket regarding the same question. I will post my answer here as well:

You can check the output Visual Studio window for any binding errors. However I tested the explained scenario and managed to achieve the desired using the following binding (the ComboBox should inherit the DataContext of the Pane):

Copy Code

<DataTemplate x:Key="MultiSelectionComboBoxSelectionBoxTemplate">
    <TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type telerik:RadComboBox}, Mode=FindAncestor},        Path=DataContext.SelectedMembersText}" />
</DataTemplate>

Please test it and let me know if it works for you. If it doesn't work, I would like to ask you to share a sample project reproducing the explained behavior, so we can investigate it on our side.

Hope this helps.

Regards,
Kalin
Telerik