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Set source and trigger for validator

<?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" trigger="{button}" triggerEvent="click"/> </mx:Application>