Sure enough, it was simple! For anyone finding this thread...here's how it's done:
1) Drop your RadContextMenu onto your form.
2) Edit the Items collection as needed.
3) ADD a RadContextMenuManager control to your form...this will auto-create a new Property for every control on that form - property name? RadContextMenu of course! Click that and your context menu created in step #1 will show up on the list.