AS3 loading movies

I have a movieclip that I have labeled mc_container on my main timeline.

I load a swf into it with this:

var i =new Loader();
i.load(new URLRequest(“myflashmovie.swf”));
mc_container.addChild(i);

it works but I can’t control the timeline of the loaded movie with the following:

i.gotoAndStop(1);

Anyone know why?