This issue is caused by the fact that the RadTreeView internally handles the KeyDown event when the Enter key is hit. The event is handled when a RadTreeViewItem Items collection isn't empty. So the KeyBinding you define will work only on such RadTreeViewItems that have no child items.
However, if you can give us more details about the scenario that you want to implement we will do our best to provide you with possible solutions.
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Is the problem still present in the latest release of Telerik?
answered on 15 Mar 2016, 12:03 PM
RadTreeView does not handle the Enter key since Q3 2011. Instead it uses CommandBindings:
CommandManager.RegisterClassInputBinding(treeViewType, new KeyBinding(RadTreeViewCommands.ToggleExpandCollapse, new KeyGesture(Key.Enter)));
Enter key toggles the expand/collapse state of the selected item. However, if you have particular issue with the enter key functionality, please provide some further details about it in a new support thread.
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