用mxml自定义事件

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" creationComplete="application1_creationCompleteHandler()"
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
    
    <fx:Script>
        <![CDATA[
            import mx.events.FlexEvent;
            protected function button1_clickHandler():void
            {
                dispatchEvent(new Event("Clicked"));
                
            }
            
            protected function application1_creationCompleteHandler():void
            {
                this.addEventListener("Clicked",handlerClick);
                trace("123");
                
            }
            
            private function handlerClick(e:Event):void{
                trace("被监听到");
            }
            
        ]]>
    </fx:Script>
    
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    <fx:Metadata>
        [Event(name="Clicked", type="flash.events.Event")]
    </fx:Metadata>
    <s:Button x="251" y="160" label="按钮" click="button1_clickHandler()"/>
</s:Application>