[Flex] ButtonBar系列——flex3 ButtonBar各项之间的间距调整

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                layout="horizontal"
                verticalAlign="middle"
                backgroundColor="white">
    
    <mx:Array id="arr">
        <mx:Object label="The" />
        <mx:Object label="quick" />
        <mx:Object label="brown" />
        <mx:Object label="fox" />
    </mx:Array>
    
    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="verticalGap:" direction="horizontal">
                <mx:HSlider id="slider"
                            minimum="-2"
                            maximum="10"
                            value="0"
                            liveDragging="true"
                            snapInterval="1"
                            tickInterval="1" />
                <mx:Label text="{slider.value}" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>
    
    <mx:ButtonBar id="buttonBar"  dataProvider="{arr}"  verticalGap="{slider.value}" direction="vertical" />
    
</mx:Application>