<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/09/17/setting-a-custom-divider-color-on-the-dividedbox-container-in-flex/ -->
<mx:Application name="HDividedBox_dividerColor_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.events.ColorPickerEvent;

            private function colorPicker_change(evt:ColorPickerEvent):void {
                dividedBox.setStyle("dividerColor", evt.color);
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="dividerColor:">
                <mx:ColorPicker id="colorPicker"
                        change="colorPicker_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:HDividedBox id="dividedBox"
            width="100%"
            height="100%">
        <mx:Box id="box1"
                backgroundColor="haloGreen"
                width="100%"
                height="100%"
                minWidth="100" />
        <mx:Box id="box2"
                backgroundColor="haloBlue"
                width="100%"
                height="100%"
                minWidth="100" />
    </mx:HDividedBox>

</mx:Application>