I imagine the answer to this is going to be pretty obvious. However... ;-)

When I pull an object from a flap onto the desktop, how can I get a handle on it so that I can send it messages programmatically?  What I am hoping is that I could drag e.g. the bouncing atom thing into a project, and then - in a workspace? - be able to send it messages.  Or, if this is completely the wrong approach, how else might I be able to play with an object instantiated in this way.

Thanks
AB