<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/10/26/customizing-the-accordion-header-in-flex-3/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        backgroundColor="white">

    <mx:Style>
        .accHeader {
            fillColors: haloSilver, haloBlue;
            fillAlphas: 1.0, 0.5;
            selectedFillColors: black, black;
        }
    </mx:Style>

    <mx:Accordion id="accordion"
            headerStyleName="accHeader"
            resizeToContent="true"
            width="100%">
        <mx:VBox label="Red"
                backgroundColor="red"
                width="100%"
                height="200" />
        <mx:VBox label="Orange"
                backgroundColor="haloOrange"
                width="100%"
                height="120" />
        <mx:VBox label="Yellow"
                backgroundColor="yellow"
                width="100%"
                height="160" />
        <mx:VBox label="Green"
                backgroundColor="haloGreen"
                width="100%"
                height="80" />
        <mx:VBox label="Blue"
                backgroundColor="haloBlue"
                width="100%"
                height="140" />
    </mx:Accordion>

</mx:Application>