loadMovie + scope? problem

programming flash
1

Hello again.
i have a strange problem with loadMovie and dynamic sizing of the holder movieclip. can anyone suggest what am i doing wrong please?

i have a function to resize the holder movie clip

function backSize() {
    myBack._width = Stage.width;
    myBack._height = Stage.height;

i also run this function on stage resize

resizeListener = new Object();
resizeListener.onResize = function() {
    backSize();
};
Stage.addListener(resizeListener);
backSize();

now, when i call a loadMovie and try to load a SWF (2000x2000px) it doesnt resize until i try to resize browser.

 myBack.loadMovie("name.swf",0);

any ideas?