改变DataGrid组件中排序的“小三角”的样式.

其实就是利用DataGrid的sortArrowSkin属性~
玩FLEX玩的不好，很多时候是因为对组件的属性知道的不充分啊~

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/02/23/changing-the-default-sort-arrow-skin-on-a-flex-datagrid-control/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" applicationComplete="init()">
<mx:Style>
    DataGrid {
        sortArrowSkin: Embed("assets/thumb_down.png");
    }
</mx:Style>
<mx:Script>
    <![CDATA[
        [Embed("assets/thumb_down.png")]
        private var thumbDownIcon:Class;

        private function init():void {
            dataGrid.setStyle("sortArrowSkin", thumbDownIcon);
        }
    ]]>
</mx:Script>

    <mx:Array id="arr">
        <mx:Object c1="Item 1A" c2="Item 1B" />
        <mx:Object c1="Item 2A" c2="Item 2B" />
        <mx:Object c1="Item 3A" c2="Item 3B" />
        <mx:Object c1="Item 4A" c2="Item 4B" />
        <mx:Object c1="Item 5A" c2="Item 5B" />
        <mx:Object c1="Item 6A" c2="Item 6B" />
        <mx:Object c1="Item 7A" c2="Item 7B" />
        <mx:Object c1="Item 8A" c2="Item 8B" />
        <mx:Object c1="Item 9A" c2="Item 9B" />
    </mx:Array>

    <mx:DataGrid id="dataGrid"
            dataProvider="{arr}"
            sortArrowSkin="@Embed('assets/thumb_down.png')"
            width="300"
            rowCount="8">
        <mx:columns>
            <mx:DataGridColumn dataField="c1"
                    headerText="Column 1:" />
            <mx:DataGridColumn dataField="c2"
                    headerText="Column 2:" />
        </mx:columns>
    </mx:DataGrid>

</mx:Application>

原文地址：http://blog.flexexamples.com/2008/02/23/changing-the-default-sort-arrow-skin-on-a-flex-datagrid-control/