<UserControl.Resources>
<DataTemplate x:Key="PanelBarItemTemplate">
<StackPanel >
<TextBlock Text="{Binding Question}" Foreground="#80a34d" FontSize="12" TextWrapping="Wrap" Width="450" />
<TextBlock Text="{Binding Answer}" TextWrapping="Wrap" Width="450" />
</StackPanel>
</DataTemplate>
<telerik:HierarchicalDataTemplate x:Key="PanelBarHeaderTemplate"
ItemsSource="{Binding RelatedItems}"
ItemTemplate="{StaticResource PanelBarItemTemplate}" >
<TextBlock Text="{Binding Category}" HorizontalAlignment="Left" TextWrapping="Wrap" Width="450" />
</telerik:HierarchicalDataTemplate>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" DataContext="{Binding}">
<telerik:RadPanelBar x:Name="radPanelBar" HorizontalContentAlignment="Left" HorizontalAlignment="Stretch"
ItemTemplate="{StaticResource PanelBarHeaderTemplate}" Width="auto">
</telerik:RadPanelBar>
</Grid>