Flex中的itemRenderer如何分发事件其所有者才能接收到

如itemRenderer是一个checkBox
<mx:itemRenderer>
  <mx:Component>
  <mx:CheckBox change="changeHandler()">
  <mx:Script>
   <![CDATA[
       import mx.events.ListEvent;
       private function changeHandler():void{
       this.owner.dispatchEvent(new Event("change_end"));
  }
 ]]>
  </mx:Script>
</mx:CheckBox>
</mx:Component>
</mx:itemRenderer>

//还可以将itemrenderer中的事件发送设为冒泡模式

dispatchEvent(new Event("change_end",true,true));

===

通过自定义事件发送参数

package widgets.layerManager.proxy
{
	import flash.events.Event;
	
	public class LayerManagerEvent extends Event
	{
		/**
		 * checkbox的选择事件
		 */
		public static var CHECKBOX_CLICK:String= "checkBoxClick"
		
		/**
		 * checkbox的label
		 */ 
		public var checkBoxLabel:String="";
		
		/**
		 * checkbox的选中状态
		 */
		public var checkBoxSelected:Boolean=false;
		//当itemrenderer中发送事件时，将自定义事件的冒泡功能打开，否则owner监听不到事件
		public function LayerManagerEvent(type:String,bubbles:Boolean=true,cancelable:Boolean=true)
		{
			super(type,bubbles,cancelable);
		}
	}
}



//

			protected function checkBox_clickHandler(event:MouseEvent):void
			{
				//this.owner.dispatchEvent(new Event("checkboxClick"));
				var e:LayerManagerEvent=new LayerManagerEvent(LayerManagerEvent.CHECKBOX_CLICK);
				e.checkBoxLabel=checkBox.label;
				e.checkBoxSelected=checkBox.selected;
				dispatchEvent(e);//需要将冒泡功能打开才可以被owner间听到
			}

//

			protected function basewidget1_creationCompleteHandler(event:FlexEvent):void
			{		
				//监听从itemrenderer中发送的事件
				tree.addEventListener(LayerManagerEvent.CHECKBOX_CLICK,treeCheckboxLayerDisplayHandler);				
			}
			private function treeCheckboxLayerDisplayHandler(event:LayerManagerEvent):void{
				//获取checkbox对应的数据源的id值. 通过遍历实现
				var layerId:String="";
				for each(var object:Object in _layerListProxy.getData()){
					if(event.checkBoxLabel==object["label"]){
						layerId=object["id"].toString();
						//trace(object["id"].toString());
						break;
					}
				}
				IocAppFacade.getInstance().sendNotification(ConstFacade.LAYER_DISPLAY,{layerId:layerId,visible:event.checkBoxSelected});//属性layerId=sde.SDE.***
			}