может так?
Добавлено через 4 минуты

Код AS3:
public function myClassName()
{
super();
if(stage)init(null) else addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(event:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
leftTopObj.x = 0;
rightTopObj.x = stage.stageWidth - rightTopObj.width;
leftBottomObj.y = stage.stageHeight - leftBottomObj.height;
rightBottomObj.x = stage.stageWidth - rightBottomObj.width;
rightBottomObj.y = stage.stageHeight - rightBottomObj.height;
}