addEventListener

[AlDev]

Господа, вот такая вот проблемка. Пишу код:

package 
{
	import flash.display.Sprite;
	import flash.display.SimpleButton;
	import flash.display.Shape;
	import flash.events.MouseEvent;
	import flash.events.MouseEventType;
	import flash.util.trace;
	
	public class myApp extends Sprite
	{
		protected var b:Array;
		public function myApp() 
		{
			this.b = new Array();
			for (var i:uint = 0;i<10;i++)
			{
				this.b[i] = new myButton();
				this.b[i].x = 60*i;
				this.b[i].y = 10;
				this.b[i].addEventListener(MouseEventType.CLICK,this.onButtonClick);
				this.addChild(this.b[i]);
			}
		}
		
		protected function onButtonClick(evnt:MouseEvent):Void
		{
			trace ('onRelease called');
		}
	}
	
	private class myButton extends SimpleButton
	{
		protected var downSprite:Shape;
		protected var upSprite:Shape;
			
		public function myButton()
		{
			this.downSprite = new Shape();
			this.downSprite.graphics.lineStyle(2, 0x202020);
			this.downSprite.graphics.beginFill(0x00FF00);
			this.downSprite.graphics.drawRect(10, 10, 50, 50);
			 
			this.upSprite = new Shape();
			this.upSprite.graphics.lineStyle(2, 0x202020);
			this.upSprite.graphics.beginFill(0xFFFF00);
			this.upSprite.graphics.drawRect(10, 10, 50, 50);
			
			this.upState = upSprite;
			this.overState = upSprite;
			this.downState = downSprite;
			this.useHandCursor = true;
			this.hitTestState = this;
		}
	}
}

а проблемка в том, что событие срабатывает только для первого элемента в массиве.
Объясните, pls, почему?