Flex中如何通过iconField样式给LinkBar添加Icon图标的例子

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">
 
    <mx:Array id="arr">
        <mx:Object label="Button"
                ico="@Embed('assets/Button.png')" />
        <mx:Object label="ButtonBar"
                ico="@Embed('assets/ButtonBar.png')" />
        <mx:Object label="CheckBox"
                ico="@Embed('assets/CheckBox.png')" />
        <mx:Object label="ColorPicker"
                ico="@Embed('assets/ColorPicker.png')" />
    </mx:Array>
 
    <mx:LinkBar id="linkBar"
            dataProvider="{arr}"
            iconField="ico" />
 
</mx:Application>