Flex 获取屏幕的分辨率

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="left"
        backgroundColor="white">
        <mx:Script>
            <![CDATA[
            [Bindable]
            public var resX:int = Capabilities.screenResolutionX; 
            [Bindable]
            public var resY:int = Capabilities.screenResolutionY;
            ]]>
        </mx:Script>   
       
        <mx:Label id="xW" text="{resX}"/>
        <mx:Label id="xH" text="{resY}"/>
    </mx:Application>