Setting the accent color on the MX Alert control default button in Flex 4

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/11/12/setting-the-accent-color-on-the-mx-alert-control-default-button-in-flex-4/ -->
<s:Application name="Halo_Alert_accentColor_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo"
        creationComplete="init();">
    <s:controlBarContent>
        <s:Button id="btn"
                label="Show alert"
                click="init();" />
    </s:controlBarContent>
 
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/halo";
 
        mx|Alert {
            accentColor: red;
        }
    </fx:Style>
 
    <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
 
            protected function init():void {
                Alert.show("Mauris sem nisl, feugiat at fermentum eget, lacinia et nisi. Aenean vitae elit purus, et placerat quam. In justo odio, euismod vel vestibulum ac, tincidunt sit amet lectus. Aliquam non est felis, at lacinia metus. Sed odio magna, adipiscing auctor elementum eu, tempus vitae tellus. Suspendisse varius felis ac ligula pellentesque egestas lobortis mauris hendrerit. Duis vulputate, leo vel lobortis aliquet, dui nunc scelerisque lacus, at convallis ipsum enim et ipsum. Aenean id posuere felis. Nullam bibendum sapien nec dui vehicula ullamcorper. Curabitur placerat auctor erat eget tristique. ", "Lorem ipsum dolor sit amet, consectetur adipiscing elit", Alert.YES|Alert.NO|Alert.OK|Alert.CANCEL);
            }
        ]]>
    </fx:Script>
 
</s:Application>