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MultiSelect ComboBox SelectionBoxTemplate binding issue

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Abdul asked on 02 Aug 2015, 12:52 PM

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" />

2 Answers, 1 is accepted

Accepted

answered on 04 Aug 2015, 06:48 AM

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

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MultiSelect ComboBox SelectionBoxTemplate binding issue

2 Answers, 1 is accepted