[BezDelnik]

var container:MovieClip = new MovieClip();
addChild(container);
for(var i:int=0; i<4; i++) {
    this["mc"+i] = new MyMc();
    this["mc"+i].x = ...;
    this["mc"+i].y = ...;
    container.addChild(this["mc"+i]);
}
 
container.getChildByName('mc0').x = ...;