改变ALERT组件的背景色和背景透明度.

backgroundAlpha, backgroundColor, borderAlpha, 和 borderColor 样式.
示例：

代码：

 

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2007/12/23/customizing-the-background-alpha-and-background-color-of-the-alert-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white"
        creationComplete ="showAlert();" >

     < mx:Script >
         <![CDATA[
            import mx.controls.Alert;

            private var alert:Alert;

            private function showAlert():void {
                alert = Alert.show("The quick brown fox jumped over the lazy dog.", "title");
            }
         ]]>
     </ mx:Script >

     < mx:Style >
        Alert {
            backgroundAlpha: 0.3;
            backgroundColor: red;
            borderAlpha: 0.3;
            borderColor: red;
            dropShadowEnabled: false;
        }
     </ mx:Style >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Button  label ="Show alert"  click ="showAlert();"   />
     </ mx:ApplicationControlBar >

</ mx:Application >