Hi Lauren Nickerson,
Since the virtualization of both the RadTreeView and the native TreeView lies on the same principles, the behavior of the ScrollViewer in the case you described is the same in both controls. Also it is an expected behavior and as far as I know you cannot workaround it.
I also attached a project containing both RadTreeView and TreeView in order to compare their behavior when virtualized. Can you take a look at it and let me know if I missing something.
Thank you in advance.
All the best,
the Telerik team
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