To make the link more prominent, I am posting it in an answer too. It looks like a bug is within the framework code and there are no workarounds found yet. I have reported the bug on Microsoft Connect: Microsoft Connect: Scrolling in virtualized WPF TreeView is very unstable There is also a maybe related … Read more
There’s actually much more to it than just making the ItemsPanelTemplate use VirtualizingStackPanel. The default ControlTemplate for ItemsControl does not have a ScrollViewer, which is the key to virtualization. Adding to the the default control template for ItemsControl (using the control template for ListBox as a template) gives us the following: <ItemsControl ItemsSource=”{Binding AccountViews.Tables[0]}”> <ItemsControl.ItemTemplate> … Read more