设置dataGrid控件的垂直列被缩放时鼠标的样式。

dataGrid控件的stretchCursor 样式学习。
示例：

代码：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/08/setting-a-custom-stretch-cursor-on-a-datagrid-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            [Bindable]
            [Embed("assets/arrow_refresh_small.png")]
            private var stretchIcon:Class;
        ]]>
    </mx:Script>

    <mx:ArrayCollection id="arrColl">
        <mx:source>
            <mx:Array>
                <mx:Object label="Student A" score="85" />
                <mx:Object label="Student B" score="48" />
                <mx:Object label="Student C" score="71" />
                <mx:Object label="Student D" score="88" />
                <mx:Object label="Student E" score="24" />
                <mx:Object label="Student F" score="64" />
                <mx:Object label="Student G" score="76" />
                <mx:Object label="Student H" score="76" />
                <mx:Object label="Student I" score="93" />
                <mx:Object label="Student J" score="88" />
                <mx:Object label="Student K" score="48" />
                <mx:Object label="Student L" score="76" />
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>

    <mx:DataGrid id="dataGrid"
            dataProvider="{arrColl}"
            stretchCursor="{stretchIcon}">
        <mx:columns>
            <mx:DataGridColumn dataField="label" />
            <mx:DataGridColumn dataField="score" />
        </mx:columns>
    </mx:DataGrid>

</mx:Application>