flex advanceddatagrid动态生成列

<?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"
?? ??? ??? ??? creationComplete="application1_creationCompleteHandler(event)">
?? ?<fx:Script>
?? ??? ?<![CDATA[
?? ??? ??? ?import mx.collections.ArrayCollection;
?? ??? ??? ?import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn;
?? ??? ??? ?import mx.events.FlexEvent;
?? ??? ??? ?
?? ??? ??? ?private var columnsArrayCollection:ArrayCollection=new ArrayCollection();
?? ??? ??? ?protected function application1_creationCompleteHandler(event:FlexEvent):void
?? ??? ??? ?{
?? ??? ??? ??? ?var datagridColumnPosition:AdvancedDataGridColumn;
?? ??? ??? ??? ?for(var i:int=0;i<250;i++)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ? //创建一列
?? ??? ??? ??? ??? ?datagridColumnPosition = new AdvancedDataGridColumn();
?? ??? ??? ??? ??? ?datagridColumnPosition.width=60;
?? ??? ??? ??? ??? ?//表头文字
?? ??? ??? ??? ??? ?datagridColumnPosition.headerText=i+"列";
?? ??? ??? ??? ??? ?//datafield
?? ??? ??? ??? ??? ?datagridColumnPosition.dataField=("d"+i.toString());
?? ??? ??? ??? ??? ?//将列添加到grid
?? ??? ??? ??? ??? ?columnsArrayCollection.addItem(datagridColumnPosition);
?? ??? ??? ??? ?}
?? ??? ??? ??? ?tab.groupedColumns=columnsArrayCollection.toArray();
?? ??? ??? ?}
?? ??? ??? ?
?? ??? ?]]>
?? ?</fx:Script>
?? ?<fx:Declarations>
?? ??? ?<!-- 将非可视元素（例如服务、值对象）放在此处 -->
?? ?</fx:Declarations>
?? ?<mx:AdvancedDataGrid id="tab" left="30" right="30" top="30" bottom="30"
?? ??? ??? ??? ??? ??? ? horizontalScrollPolicy="on" textAlign="center" verticalScrollPolicy="on" sortExpertMode="true">
?? ?</mx:AdvancedDataGrid>
</s:Application>
//类似实例，显示- -
detailGrid.groupedColumns=columnsArrayCollection.toArray();

对于表头多行的：

在生成ColumnGroup和column的时候，将每个column对应到每个group上