Hello Manuela,
The
RadTreeView control doesn't support this functionality out-of-the-box. But you can edit the default
ControlTemplate of the
RadTreeView control and set a custom
ControlTemplate for the
ScrollViewer element.
In the
ControlTemplate of the
ScrollViewer you need to handle the
MouseWheel event of the
ScrollContentPresenter. I attached a sample project that demonstrates this approach. Let me know if it helps.
Greetings,
Tina Stancheva
the Telerik team
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