Flex中datagrid动态添加列

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="init()">
<mx:Script>
<![CDATA[
import mx.controls.dataGridClasses.DataGridColumn;
import mx.collections.ArrayCollection;
import mx.controls.DataGrid;
import mx.events.ListEvent;
import mx.controls.ComboBox;
[Bindable]
// 自定义数据源
private var dgDataArr:Array = [{name: "Jon", job: "officer",addnew:'aaaa'},
{name: "James", job: "seller",addnew:'bbbb'},
{name: "Jodon", job: "manager",addnew:'cccc'},
{name: "Jon", job: "officer",addnew:'aaaa'},
{name: "Jon", job: "officer",addnew:'aaaa'},
{name: "Jon", job: "officer",addnew:'aaaa'}];

private function init():void
{
var dgData:ArrayCollection = new ArrayCollection(dgDataArr);
dgData.filterFunction
// 自定义DataGrid控件
var dataGrid:DataGrid = new DataGrid();
dataGrid.x = 10; // X轴坐标
dataGrid.y = 20; // Y轴坐标
dataGrid.editable = false; // 数据项是否能编辑
dataGrid.percentWidth = 100; // 控件宽度
dataGrid.percentHeight = 100; // 控件高度
dataGrid.setStyle("fontSize", 14);
dataGrid.styleName
dataGrid.dataProvider = dgData; // 设置数据源
dataGrid.addEventListener(ListEvent.ITEM_CLICK, itemClickHandler); // 添加监听事件类型与触发函数
addChild(dataGrid); // 添加dataGrid控件

var columns:Array = new Array();
var col:DataGridColumn;
for ( var i:* in dgDataArr[0] ) {
col = new DataGridColumn(i);
columns.push(col);
}
dataGrid.columns = columns;

}
private function itemClickHandler(e:ListEvent):void
{
trace(e.target);
}
]]>
</mx:Script>
</mx:Application>