How do I control a parent loading movie?

[OM2]

Can someone tell me how I can control a parent loading movie?

i.e. a.swf loads b.swf.

I want to be able to issue a command that makes something happen in a.swf.

From b.swf, I've tried _parent.gotoAndPlay("myFrame") - this has no effect. :(

Thanks.


OM