Flex 2.1 ChangeWatcher working only once

I have been working with flex 2.1 for a while now and have recently used the ChangeWatcher for finding out when the value of the variable changes.

The handler is getting invoked once when the value is getting changed. But for subsequent changes, I believe the handler is not being called.

My code is something as follows:

Could someone please advice as to what could be going wrong?

File:Caller.mxml(it is a popup screen)

//in mx:Script

private var watch:ChangeWatcher = ChangeWatcher.watch(a,"numberOfItems",updateScreen);

private function updateScreen(event:Event):void{
Alert.show(a.numberOfItems);

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File: A.as

[Bindable] public var numberOfItems:int;

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ChikithegreatAsked:
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dgofmanConnect With a Mentor Commented:
Workd for me, only exception when you may not get fire event is assigning value is the same as exisitng numberOfItems, in this cse you should create a setter and dispatchEvent manually or temporary assign to -1 or some other number

Main.mxml

<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" width="100%" height="100%" initialize="init()" xmlns:projectWork="*">
	<s:layout>
		<s:VerticalLayout/>
	</s:layout>
	<fx:Script>
		<![CDATA[
			import mx.binding.utils.ChangeWatcher;
			import mx.controls.Alert;
			

			private var a:A = new A();
			private var watch:ChangeWatcher = ChangeWatcher.watch(a,"numberOfItems", updateScreen);
			
			private function updateScreen(event:Event):void{
				Alert.show(String(a.numberOfItems)); 
			}
		]]>
	</fx:Script>
	<s:Button label="Increment" click="a.numberOfItems++"/>
</s:Application> 

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A.as

package
{
	public class A
	{
		[Bindable]
		public var numberOfItems:int = 0; 
	}
}

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