Presentation : MC actionsrcipt removal

I’ve been playing around with the presentation screens and slide in Flash, from browsing the web there seems to be very little if any information of how to control MC’s within different parts of a presentation ie removing them or changing alpha

I’ve loaded an MC and now I’m am trying to remove it from the stage been experiment on the same slide and I just cant seem to get control of it

I was using
_root.slide1.intromc._alpha = 0;

but this doesn’t work for

any ideas how I can get access to MCs in a slide if its possible !!!