flex中datagrid合并单元格 第一列锁定

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
?? ??? ??? ??? xmlns:s="library://ns.adobe.com/flex/spark"
?? ??? ??? ??? xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
?? ?<fx:Declarations>
?? ??? ?<!-- 将非可视元素（例如服务、值对象）放在此处 -->
?? ?</fx:Declarations>
?? ?<mx:AdvancedDataGrid id="adg1" x="277" y="57" width="553" height="342" designViewDataType="flat"
?? ??? ??? ??? ??? ??? ? sortableColumns="false" sortExpertMode="true" lockedColumnCount="1"
?? ??? ??? ??? ??? ??? ? horizontalScrollPolicy="on">
?? ??? ?<mx:groupedColumns>
?? ??? ??? ?<mx:AdvancedDataGridColumnGroup headerText="名 称">
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="项目" />
?? ??? ??? ?</mx:AdvancedDataGridColumnGroup>
?? ??? ??? ?<mx:AdvancedDataGridColumnGroup headerText="水电" textDecoration="underline">
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划出力" />
?? ??? ??? ?</mx:AdvancedDataGridColumnGroup>
?? ??? ??? ?<mx:AdvancedDataGridColumnGroup headerText="大朝山" textDecoration="underline">
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划出力" />
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划水位"? />
?? ??? ??? ?</mx:AdvancedDataGridColumnGroup>
?? ??? ??? ?<mx:AdvancedDataGridColumnGroup headerText="漫湾" textDecoration="underline">
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划出力" />
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划水位" />
?? ??? ??? ?</mx:AdvancedDataGridColumnGroup>
?? ??? ??? ?<mx:AdvancedDataGridColumnGroup headerText="…其余电厂依次类推" textDecoration="underline">
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划出力" />
?? ??? ??? ??? ?<mx:AdvancedDataGridColumn headerText="计划水位" />
?? ??? ??? ?</mx:AdvancedDataGridColumnGroup>
?? ??? ?</mx:groupedColumns>
?? ?</mx:AdvancedDataGrid>
</s:Application>