Notification of clipboard activity...

My application has a toolbar that I would like to act like the VS 2005 toolbar, with respect to the paste button. In VS2005, it is disabled if the item currently on the clipboard is not valid for pasting into the editor, and the editor is the currently selected control. I've been able to get this mostly working, but the problem I have is that when the syntax editor is the current control (and the item on the clipboard is not valid), but then I select some text in the editor and press Ctrl-C, I want the paste button to change to enabled.

The problem is, I can't see any easy way to receive notification that the Ctrl-C happened. Is there some notification event I can hook into to receive notification of this action? Is this something you could expose in a maintenance release.

Thanks...