Is it possible to provide us with more information on the case or send us a sample solution reproducing the issue. At our side when we use the App key on given RadTreeViewItem
it triggers the MouseHover animation on the parent node but does not change the SelectedItem
nor opens the wrong context menu.
However, as triggering the hover effect is not intended, we created a work item for it. You can track it's progress here
Please accept our apology for the inconvenience.
the Telerik team