We have changed the Source and OriginalSource properties of RadContextMenu Opened and Closed events to return the RadContextMenu instance. They were returning the element which handled the MouseRightButtonUp (in case EventName is MouseRightButtonUp) and caused RadContextMenu to Open/Close. But this was different in WPF so we fix it.
ItemClick will continue to work as before - OriginalSource is the RadMenuItem that was clicked.
We should probably improve the description of this item in the release notes.
Let us know if you need more information.
the Telerik team