How can I control stage position for swfs loaded by Loader class?

I'm creating a grid of buttons that, when clicked, will load a specific swf and I'd like for each swf to play in a certain portion of the stage.  When I use the Loader class:

var my_loader:Loader = new Loader();
my_loader.load(new URLRequest("abc.swf"));
addChild(my_loader);

the swf always displays at top left.  Is this an attribute of the individual swfs that I'm loading, or can I address the position in the main movie?

Thanks-

Sean