flex PopUpManager createPopUp方式弹出窗口

createPopUp:是上来先设置好弹出方式，然后在new出来一个TitleWindow的对象，然后通过此对象设置他的变现形式。

addPopUp：是先new出来对象，设置好表现形式，然后在选择弹出来的方式。

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
      xmlns:s="library://ns.adobe.com/flex/spark" 
      xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768" 
    >
<fx:Declarations>
   <!-- Place non-visual elements (e.g., services, value objects) here --> 
</fx:Declarations>

<fx:Script>
   <![CDATA[
    import mx.managers.PopUpManagerChildList;    
    import mx.controls.Label;    
    import mx.events.CloseEvent;    
    import mx.containers.TitleWindow;    
    import mx.managers.PopUpManager;    
   
    private var titleWindow:TitleWindow;    
   
    private function init():void {    
     var label:Label = new Label();    
     label.text = "Hello world";    
     titleWindow = new TitleWindow();    
     titleWindow = TitleWindow(PopUpManager.createPopUp(this,TitleWindow,true));    
     titleWindow.title = "Custom title";    
     titleWindow.showCloseButton = true;    
     titleWindow.width = 240;    
     titleWindow.height = 180;    
     titleWindow.addChild(label);    
     titleWindow.addEventListener(CloseEvent.CLOSE, titleWindow_close);    
     PopUpManager.centerPopUp(titleWindow);    
    }    
   
    private function titleWindow_close(evt:CloseEvent):void {    
     PopUpManager.removePopUp(titleWindow);    
    }

protected function button1_clickHandler(event:MouseEvent):void
    {
     init();
    }

]]>
</fx:Script>
<s:Button x="6" y="0" label="PopUpManager createPopUp方式 弹出窗口" width="375" height="36" click="button1_clickHandler(event)"/>

</s:Application>

留作参考，文章来源：http://hi.baidu.com/miracle5460/item/be9d74c37e3cba2c46d5c0e4