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Create and invoke a validator programmatically in when a user clicks a Button control

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">   <mx:Script>          import mx.validators.ZipCodeValidator;     private var v:ZipCodeValidator = new ZipCodeValidator();     private function performValidation():void {       v.domain = "US or Canada";       v.listener=myZip;       v.validate(myZip.text);     }   </mx:Script>   <mx:TextInput id="myZip" />   <mx:Button label="Submit" click="performValidation();" /> </mx:Application>