Reference main timeline from external swf

programming flash
1

im trying to tell my main movie to goto a certain movieclip in the timeline from my loaded external swf heres the code Im working with,

_level0.myMC.gotoAndPlay(45);
unloadMovieNum(1)

I can tell the script is executing because the external movieclip unloads itself but the main movie does nothing.
Any ideas or changes I could try?

Thanks