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Clearing a validation error

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">   <mx:Script>          import mx.events.ValidationResultEvent;     private var vResult:ValidationResultEvent;     private function validateAndSubmit():void {       vResult = zipV.validate();       if (vResult.type==ValidationResultEvent.INVALID)         return;     }     private function resetForm():void {       zipInput.errorString = '';     }        </mx:Script>   <mx:ZipCodeValidator id="zipV" source="{zipInput}" property="text" />   <mx:Form>     <mx:FormItem label="Enter ZIP code">       <mx:TextInput id="zipInput" />     </mx:FormItem>     <mx:FormItem label="Enter Country">       <mx:TextInput id="cntryInput" />     </mx:FormItem>   </mx:Form>   <mx:Button label="Submit" click="validateAndSubmit();" />   <mx:Button label="Reset" click="resetForm();" /> </mx:Application>