[_SAM_]

Stage.scaleMode = "noScale";
Stage.align = "TL";
 
var st_listener:Object = new Object();
st_listener.onResize = function(){
// по середине
       my_mc._x=(Stage.width/2)-(my_mc._width/2)
}
Stage.addListener(st_listener)
st_listener.onResize();