Controlling the z-index of library instances and dynamic content via as3

Hey

Below given is a sample for AS3 'z-index"
//
setChildIndex is the way to set the z-order
//

Jon

Eg:

import flash.display.Sprite;
import flash.events.MouseEvent;

var container:Sprite = new Sprite();
addChild(container);

var circle1:Sprite = new Sprite();
circle1.graphics.beginFill(0xFF0000);
circle1.graphics.drawCircle(40, 40, 40);
circle1.addEventListener(MouseEvent.CLICK, clicked);
 
var circle2:Sprite = new Sprite();
circle2.graphics.beginFill(0x00FF00);
circle2.graphics.drawCircle(100, 40, 40);
circle2.addEventListener(MouseEvent.CLICK, clicked);
 
var circle3:Sprite = new Sprite();
circle3.graphics.beginFill(0x0000FF);
circle3.graphics.drawCircle(70, 80, 40);
circle3.addEventListener(MouseEvent.CLICK, clicked);
 
container.addChild(circle1);
container.addChild(circle2);
container.addChild(circle3);
addChild(container);
 
function clicked(event:MouseEvent):void {
    var circle:Sprite = Sprite(event.target);
    var topPosition:uint = container.numChildren - 1;
    container.setChildIndex(circle, topPosition);
}

I see how you can initially set the depth arrangement of all of the movie clips, but if you wish to control the depth value of some movie clips sporadically , how would you be able to that?