I didn't mean that you have to delete your ScrollViewer's style. You just have to add a x:Name=ScrollViewer in it. Which means that the ScrollViewer's style should looks like this:
The x:Name is needed because in the code when you move your finger the RadTreeView
search the ScrollViewer by his x:Name and if it is not set the ScrollViewer is null and a NullReferenceException is thrown.
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