FLEX 事件机制-自定义事件

package    
{  
    import flash.events.Event;  
  
    public class MyEvent extends Event  
    {  
        public static const myEvent:String="myEvent";  
          
        public var data:*;  
          
        public function MyEvent(type:String,bubbles:Boolean=false,cancellabel:Boolean=false,data:* = null)  
        {  
            super(type,false,false);  
            this.data = data;  
        }  
          
        override public function clone():Event{  
            return new MyEvent(myEvent,false,false,data);  
        }  
          
        override public function toString():String{  
              
            return formatToString("MyEvent");  
        }   
    }  
}