[Closed] Cancel Deletion

I’m curious, is there some way to cancel a delete operation? I’ve got a fairly complex rig using scripted property controllers and it throws a lot of errors when you delete a rig component. I would like to open a message box that warns the user that they are about to royally screw the rig and give them a button to cancel the operation if they didn’t mean to do this. I can open the messagebox using the #predelete general callback, but I can’t get a cancel button to stop the deletion from happening.