Stopping an external .swf

Hi

Can someone please help me.

I am loading in an external .swf into a movieclip, however this automatically streams the .swf before it is completely loaded. This is a problem because I am using a progress bar and transition and the movie starts to soon.

I have tried the following script:
movieclip.stop();

Please note that i am reluctant to put a stop(); in the first frame of the external .swf.

Thanks in advance,
Jamie