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  4. Create and invoke a validator programmatically when a user clicks a Button control

    
    xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
    
        
    
     
         
        // Import ZipCodeValidator. 
        import mx.validators.ZipCodeValidator; 
        private var v:ZipCodeValidator = new ZipCodeValidator(); 
        private function performValidation():void { 
            v.domain = "US or Canada"; 
            // Set the listener property to the component 
            // used to display validation errors. 
            v.listener=myZip; 
            v.validate(myZip.text); 
        }