<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init();">
 
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.styles.StyleManager;
 
            private var alert:Alert;
            private var alertCSS:CSSStyleDeclaration;
 
            private function init():void {
                alertCSS = StyleManager.getStyleDeclaration("Alert");
            }
 
            private function showAlert(color:Object):void {
                alertCSS.setStyle("modalTransparencyColor", color);
                alertCSS.setStyle("themeColor", color);
                alert = Alert.show("The quick brown fox...");
            }
        ]]>
    </mx:Script>
 
    <mx:ApplicationControlBar dock="true">
        <mx:Button label="Red"  themeColor="red"  click="showAlert('red');" />
        <mx:Button label="Green"  themeColor="haloGreen"  click="showAlert('haloGreen');" />
        <mx:Button label="Blue"  themeColor="haloBlue"  click="showAlert('haloBlue');" />
    </mx:ApplicationControlBar>
 
</mx:Application>