Yes, only RadControls have these events, that extend the functionality of base Control, which is generally provided by the OS.
Nevertheless implementing drag and drop for RadElements should not be a great problem, since all RadElement support hit-testing. Also visual feedback can be achieved by painting RadElement in a bitmap using its GetAsBitmap method.
I've attached a sample that demonstrates how you can reorder RadItems In a ListBox by drag & drop.
Let me know if you need further assistance with this.
the Telerik team