Detecting clicks behind a movie clip

Hey all, I’ve searched through the forums but couldn’t find the answer to my question, it might be completely obvious but I’m kind of stumped.

Is there a way to have a movie clip ignore clicks to it, but still be visible and accept Actionscript commands? Let me describe the situation:

I have a MovieClip set as the stage, which covers most of my movie.
I have a button which, when pressed, attaches a MovieClip to _root and makes it semi transparent. _root then has an EnterFrame handler which moves this semi transparent clip so that it’s stuck to the mouse
I want to be able to click down on the stage and attach another MovieClip, but because I have this semi transparent clip following the mouse, I guess it steals the clicks because the stage clip isn’t responding.

(this is basically an RTS style click and build, the semi transparent clip is showing you where it’s going to build)

Am I doing this all wrong? Can anybody give me an idea of how this sort of thing is usually done?

Thanks.