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Form data validation

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">     <mx:Form>         <mx:FormItem label="Name">             <mx:TextInput id="username"/>         </mx:FormItem>         <mx:FormItem>             <mx:Button id="button" label="Submit"/>         </mx:FormItem>     </mx:Form>     <mx:Validator source="{username}" property="text" /> </mx:Application>