在FLEX中创建自定义弹出窗口.

使用PopUpManager 和TitleWindow 类：
示例：

代码：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/08/20/creating-custom-dialog-boxes-using-the-popupmanager-and-titlewindow-classes/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init()">

    <mx:Script>
        <![CDATA[
            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.title = "Custom title";
                titleWindow.showCloseButton = true;
                titleWindow.width = 240;
                titleWindow.height = 180;
                titleWindow.addEventListener(CloseEvent.CLOSE, titleWindow_close);
                titleWindow.addChild(label);

                PopUpManager.addPopUp(titleWindow, this, true);
                PopUpManager.centerPopUp(titleWindow);
            }

            private function titleWindow_close(evt:CloseEvent):void {
                PopUpManager.removePopUp(titleWindow);
            }
        ]]>
    </mx:Script>

    <mx:Button label="Launch TitleWindow" click="init()" />

</mx:Application>