Setting skins on the the Flex ButtonBar control

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/01/10/setting-skins-on-the-the-flex-buttonbar-control/ -->
<mx:Application name="ButtonBar_buttonStyleName_skin_test "
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">
 
    <mx:Style>
        ButtonBar {
            buttonStyleName: myCustomButtonStyleName;
            color: #999999;
        }
 
        .myCustomButtonStyleName {
            skin: Embed(source="assets/ButtonBarSkins.swf",
                        symbol="ButtonBarButton_skin");
        }
    </mx:Style>
 
    <mx:Script>
        <![CDATA[
            import mx.events.SliderEvent;
 
            private function slider_change(evt:SliderEvent):void {
                buttonBar.setStyle("buttonHeight", evt.value);
            }
        ]]>
    </mx:Script>
 
    <mx:Array id="arr">
        <mx:Object label="Button" />
        <mx:Object label="ButtonBar" />
        <mx:Object label="ColorPicker" />
        <mx:Object label="ComboBox" />
    </mx:Array>
 
    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="buttonHeight:">
                <mx:HSlider id="slider"
                        minimum="24"
                        maximum="64"
                        snapInterval="1"
                        tickInterval="4"
                        liveDragging="true"
                        change="slider_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>
 
    <mx:ButtonBar id="buttonBar"
            dataProvider="{arr}" />
 
</mx:Application>