Yeah, I forgot that button events are handled very narrowly. I’m not even sure I remember why it’s the case. Sorry for the run around.
Can we take a step back a minute and describe what you are trying to do (pictures would be nice, too) and maybe I can help plot a way to make it happen. I have done drag-and-drop before in Lemur a few times so I know it can be done… but maybe there is a better way if I know some other use-cases.