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Validating required fields

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">   <mx:StringValidator id="reqV" source="{inputA}" property="text" required="true" />   <mx:TextInput id="inputA" />   <mx:Button label="Submit" click="reqV.validate();" /> </mx:Application>