弹出窗口的显示和位置PopUpManager
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Canvas horizontalCenter="0" verticalCenter="0">
<mx:LinkButton label="Top" x="100" y="10" click="showDetail(event)"/>
...
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Canvas horizontalCenter="0" verticalCenter="0">
<mx:LinkButton label="Top" x="100" y="10" click="showDetail(event)"/>
...