Acess a Function in Stage From a MovieClip

programming flash
1

I have a MovieClip that’s inside another MovieClip that belongs to a MovieClip Container that works inside a function in my Stage (Srry for the huge confusion :P). In that MovieClip i have a button that goes back and runs that function again, so i tried this

In my stage i put:

var fuubar:Function = showArtista;

and then, inside that MovieClip :

root["fuubar"](2)

Except it says it can’t find the function and there is no standard value. Any ideas?