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Headers and "UpdateSourceTrigger=PropertyChanged"

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ListBox

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

Stephen asked on 22 Dec 2015, 06:47 PM

I recently wanted to add "headers" to my ListBox and was able to do so thanks to the following post:

http://www.telerik.com/forums/can-a-listbox-have-headers

However, now I haven't been able to have the entries in the listbox refresh when the underlying data changes. It seemed to work just find before the "headers" were added. I have attached the original code when the data binding seemed to work fine:

<telerik:RadListBox HorizontalAlignment="Left" Height="235" Margin="24,13,0,0" VerticalAlignment="Top" Width="510" ItemsSource="{Binding Associates, UpdateSourceTrigger=PropertyChanged}" SelectedIndex="{Binding AssocIdx, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" DisplayMemberPath="display">

        </telerik:RadListBox>

and the code where the headers works fine (but data binding doesn't seem to work when the data changes...):

<telerik:RadListBox HorizontalAlignment="Left" Height="235" Margin="24,13,0,0" VerticalAlignment="Top" Width="510" ItemsSource="{Binding Source={StaticResource groups}, UpdateSourceTrigger=PropertyChanged}" SelectedIndex="{Binding AssocIdx, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" DisplayMemberPath="">

<telerik:RadListBox.ItemTemplate>

<DataTemplate>

<VirtualizingStackPanel>

<TextBlock Text="{Binding display}" />

</VirtualizingStackPanel>

</DataTemplate>

</telerik:RadListBox.ItemTemplate>

<telerik:RadListBox.GroupStyle>

<GroupStyle HeaderTemplate="{StaticResource groupTemplate}" />

</telerik:RadListBox.GroupStyle>

</telerik:RadListBox>

Headers and "UpdateSourceTrigger=PropertyChanged"

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