[alexniks]

тогда используй матрицу

import flash.geom.Matrix;
import flash.geom.Transform;
 
var scale:Number = 1;
 
mc1.addEventListener(MouseEvent.CLICK,clickevent);
 
function clickevent(e:MouseEvent):void{
	scale += 0.2;
	var mat:Matrix = new Matrix();
	mat.scale(scale,scale);
	mat.translate(-mc1.mouseX * scale +stage.stageWidth/2,-mc1.mouseY * scale + stage.stageHeight/2);
	mc1.transform.matrix = mat;
}

или пример без матрицы

var scale:Number = 1;
 
mc1.addEventListener(MouseEvent.CLICK,clickevent);
 
function clickevent(e:MouseEvent):void{
	scale += 0.2;
	mc1.x = -mc1.mouseX * scale +stage.stageWidth/2;
	mc1.y = -mc1.mouseY * scale + stage.stageHeight/2;
	mc1.scaleX = mc1.scaleY = scale;
}