4강. addChild

 >>>ex

ham_mc.addEventListener(MouseEvent.MOUSE_DOWN, onStart);
potato_mc.addEventListener(MouseEvent.MOUSE_DOWN, onStart);
coca_mc.addEventListener(MouseEvent.MOUSE_DOWN, onStart);

function onStart(e:MouseEvent):void{
 //e.currentTarget 과같음
 var mc:MovieClip = e.currentTarget as MovieClip;
 mc.startDrag(false);
 //스테이지에 선택한 mc를 갖다붙임.결국 맨위로올라옴
 this.addChild(mc);
}

ham_mc.addEventListener(MouseEvent.MOUSE_UP, onStop);
potato_mc.addEventListener(MouseEvent.MOUSE_UP, onStop);
coca_mc.addEventListener(MouseEvent.MOUSE_UP, onStop);

function onStop(e:MouseEvent):void{
 var mc2:MovieClip = e.currentTarget as MovieClip;
 mc2.stopDrag();
}