air实现窗体拖动

<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
??? ??? ??? ??? ??? ?? xmlns:s="library://ns.adobe.com/flex/spark"
??? ??? ??? ??? ??? ?? xmlns:mx="library://ns.adobe.com/flex/mx"
??? ??? ??? ??? ??? ?? height="555"
??? ??? ??? ??? ??? ?? width="798"
??? ??? ??? ??? ??? ?? skin>

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看到了吧！ 就是mouseDown事件这句话！ 非常简单