OK, so, I have a ListView-derived control that changes Grouping and ItemsSource on the fly. When I group such that the scrollbars dissapear, and then change my ItemsSource to a different ICollectionView, my scrollbars do not return.
The basic problem is that ListView changes to a VirtualizedStackPanel when grouping is activated and does not change back when grouping is de-activated.
I don't mind that virtualization is disabled when grouping--this is not a problem. What I need is a way to make the ListView regenerate it's ItemPanel when I change the ItemsSource.