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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;
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