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RadPanelBar, SelectedItem and Expansion not working correctly

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klogand asked on 31 May 2011, 10:34 PM
I have ViewModel and a View. The View has the RadPanelBar and the bar's ItemSource is a collection of
containers(to handle the hierarchical data template). I'm also binding the SelectedItem to the view model's
CurrentPanelBarContainer. I was expecting the CurrentPanelBarContainer to be the one that is expanded, but
it is not. What's the correct way to get this working?

telerikNavigation:RadPanelBar AutomationProperties.AutomationId="zonesPanelBar" x:Name="zonesPanelBar" VerticalAlignment="Stretch" Margin="5"
                                          ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Hidden"
                                          ItemsSource="{Binding PanelBarZoneContainers}"
                                          SelectedItem="{Binding CurrentPanelBarContainer, Mode=TwoWay}"
                                          IsSingleExpandPath="True" ExpandMode="Single">
              <telerik:HierarchicalDataTemplate ItemsSource="{Binding Path=ZonesForTab}">
                 <!-- ZonesForTab are PanelBarZoneContainerViewModel -->
                 <!-- MouseLeftButtonDown="templateZoneHeaderStackPanel_MouseLeftButtonDown" -->
                 <StackPanel x:Name="templateZoneHeaderStackPanel" Orientation="Horizontal">
                    <Border Visibility="{Binding ZoneExtender.IsRootZone, Converter={StaticResource InverseVisibilityConverter}}" Background="Black" Height="17" Width="17" BorderThickness="1" CornerRadius="4" Margin="3,0,0,0">
                          <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                             <GradientStop Color="Black" Offset="0"/>
                             <GradientStop Color="#FFCCCCCC" Offset="1"/>
                       <Border Background="{Binding ZoneExtender.ColorKey}" Visibility="Visible" Margin="2" CornerRadius="2"/>
                    <TextBlock Style="{StaticResource W11ArialTextBlock}" FontWeight="{Binding ZoneExtender.IsRootZone, Converter={StaticResource BooleanToFontBoldConverter}}" Text="{Binding ZoneExtender.ZoneName, Mode=TwoWay}" Margin="6,0,0,0"/>
                       <views:ZonePropertiesTabView />

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Petar Mladenov
Telerik team
answered on 02 Jun 2011, 11:59 AM
Hi klogand,

Yes, the behavior you have come up with is expected. Binding the SelectedItem property of the RadPanelBar or binding the IsSelected property of the RadPanelBarItem will only select the item. In order to be expanded you have to bind also the IsExpanded property of the RadPanelBarItem via ContainerBindings. Please let us know if you need further assistance ont this.

Best wishes,
Petar Mladenov
the Telerik team
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Petar Mladenov
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