[iNils]

У вас должно быть примерно так

function attachMovie (linkage:DisplayObject, x:Number, y:Number, parentMc:DisplayObjectContainer):DisplayObject {
	linkage.x = x;
	linkage.y = y;
	parentMc.addChild (linkage);
	return linkage;
}
 
for (var i=0; i<5; i++){
	var mcItem:MovieClip = attachMovie (new baseMс (), 10, i * 60, this) as MovieClip;
	mcItem.buttonMode = true;
	.........
}