Use id to reference control

     

<?xml version='1.0' encoding='UTF-8'?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.controls.Alert;
        public function checkValue(inputValue:String):void
        {
            if(inputValue.length < 5)
                Alert.show("Are you sure there's not that much new?");
        }
        public function submitClicked():void
        {
            Alert.show("User says:" + whatsnew.text + " is new.");
        }
      
    </mx:Script>

        <mx:Label text="What's new?" />
        <mx:TextInput valueCommit="checkValue(event.currentTarget.text)" id="whatsnew" />
        <mx:Button label="Submit" click="submitClicked()" />
    
</mx:Application>

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Use id to reference control : Spark component « Components « Flex

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