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>

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Set source and trigger for validator : Validator « Development « Flex

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