flex自定义组件button实现关闭

<?xml version="1.0" encoding="utf-8"?>
<s:Button xmlns:fx="http://ns.adobe.com/mxml/2009" 
		  xmlns:s="library://ns.adobe.com/flex/spark" 
		  xmlns:mx="library://ns.adobe.com/flex/halo" label="关闭" click="navigateToURL(new URLRequest('javascript:window.opener=null;window.close()'),'_self')">
</s:Button>