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Bind form input control to Model

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