求助：如何使flex datagrid某个单元格不可编辑

我在datagrid中某单元格上编辑了数据，现在想达到以下目的：在对某个单元格进行编辑了之后，此单元格的editable属性就变为false，请问是否可以实现？如能实现，该如何做？

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在datagrid的editend事件，
找到编辑的选项。设置editable=false

仅供参考，没实现过

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XML code:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">

<mx:Script>
<![CDATA[
import flash.utils.Dictionary;

import mx.collections.ArrayCollection;
import mx.events.DataGridEvent;

private var dictionary:Dictionary = new Dictionary();

private var oldValue:Object;

private function gridItemEditBeginning(event:DataGridEvent):void
{
var key:String = event.dataField + "_" + event.rowIndex;
var currentValue:Object = (grid.dataProvider as ArrayCollection).
getItemAt(event.rowIndex)[event.dataField];
if (dictionary[key])
{
if (dictionary[key] != currentValue)
{
event.preventDefault();
return;