Flex中如何利用PopUpManager类创建一个弹出Image控件的例子
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white" viewSourceURL="srcview/index.html">

<mx:Style>
global {
modalTransparencyBlur: 0;
modalTransparency: 0.9;
modalTransparencyColor: black;
modalTransparencyDuration: 500;
}
</mx:Style>

<mx:Script>
<![CDATA[
import mx.controls.Image;
import mx.managers.PopUpManager;

private const IMG_PREFIX:String = "http://blog.minidx.com/ext/";

private function popIt(src:String):void {
var img:Image = new Image();
img.addEventListener(MouseEvent.CLICK, img_click);
img.addEventListener(Event.COMPLETE, img_complete);
img.load(IMG_PREFIX + src);
img.toolTip = img.source.toString();
PopUpManager.addPopUp(img, this, true);
}

private function img_complete(evt:Event):void {
var img:Image = evt.currentTarget as Image;
img.width = img.contentWidth;
img.height = img.contentHeight;
PopUpManager.centerPopUp(img);
}

private function img_click(evt:MouseEvent):void {
var img:Image = evt.currentTarget as Image;
PopUpManager.removePopUp(img);
}
]]>
</mx:Script>

<mx:ApplicationControlBar dock="true">
<mx:Button label="image 1" click="popIt('image1.jpg');" />
<mx:Button label="image 2" click="popIt('image2.jpg');" />
<mx:Button label="image 3" click="popIt('image3.jpg');" />
</mx:ApplicationControlBar>

</mx:Application>