How Can I Store Flex Combobox Text Input Values

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Flex

AS3

Hi,
Am using this below code to update custom values.

<?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="200" minHeight="200">
	<fx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.events.FlexEvent;
			
			import spark.events.TextOperationEvent;
			
			[Bindable]
			public var complexDP:ArrayCollection = new ArrayCollection(
				[   {ingredient:"Salmon", category:"Meat"}, 
					{ingredient:"Potato", category:"Starch"}, 
					{ingredient:"Cucumber", category:"Vegetable"}, 
					{ingredient:"Steak", category:"Meat"}, 
					{ingredient:"Rice", category:"Starch"}, 
					{ingredient:"Cumin", category:"Spice"}
				]                
			);
			
			private function myLabelToItemFunction(input:String):*
			{				
				return {ingredient:input, category:"mystery"};				
			}
		
	</fx:Script>
	<s:VGroup>
		<s:ComboBox id="cb" dataProvider="{complexDP}" width="150" labelToItemFunction="{myLabelToItemFunction}" selectedIndex="0" labelField="ingredient"/>
	</s:VGroup>
	 
	
</s:Application>

This function is used to set custom values.First time its working again i tried to make some changes in combobox textInput the old values in appears again and again.