Hi Jane,
Calling Where() on an observable collection returns a WhereEnumerator which is a non-observable enumerator that just walks the given collection. It will not notify its destination if the source changes.
this.groupTreeListView.ItemsSource = loadOperation.Entities.Where(t => t.ParentGroup == null);
There is a way to achieve this using a CollctionView:
Hopefully this will help you,
Regards,
Miroslav
the Telerik team
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