[PD] Clickable gop data structures

Hi,

I'm just starting to get my hands dirty with data structures. In particular GOP data structures. Inspired by Chris Mccormick's wonderful s- abstractions, I'm trying to make a simple GOP transport, with graphical play/stop/pause rewind etc. controls. The main showstopper at the moment is that I don't seem to be able to make the UI elements 'clickable'.

Using [tot] I can detect the mouse position when clicking inside the subpatch, but when the graph is on parent, this doesn't work. Of course, I don't want to use [tot] in the parent, because the GOP subpatch might well move.

Is there some other way to make a clickable element? Chris's s-env abstraction seems to detect ctrl-click, but It isn't obvious to me how this is achieved...

Jamie