flex 全局分发,监听 事件

package 
{
	import flash.events.EventDispatcher;
	import flash.events.IEventDispatcher;
	
	public class MessageDispatch extends EventDispatcher
	{
		private static var instance:MessageDispatch;
		public function MessageDispatch(target:IEventDispatcher=null)
		{
			super(target);
		}
		public static function getInstance():MessageDispatch
		{
			if(instance==null)
			{
				instance=new MessageDispatch();
			}
			return instance;
		}
		
		public var msg:String
	}
}

　　

MessageDispatch.getInstance().dispatchEvent(new Event("send",true));
MessageDispatch.getInstance().addEventListener("send",sendmethod);

　　

protected function sendmethod(event:Event):void
{
     Alert.show("send","msg",1,this);
}

　　不写注释了.很简单的代码.分发后,可以全局进行监听