[v1v2v3]

Выкладываю скрипт, mc4 - красный прямоугольник

Stage.align = "TL";
Stage.scaleMode = "noScale";
var resizeListener:Object = new Object();
resizeListener.onResize = function() {
	mc2._x =Stage.width-250;
	mc3._x = Stage.width-mc3._width;
	mc4._x =Stage.width-250;
};
Stage.addListener(resizeListener);