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Use CreditCardValidator

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">   <mx:VBox>     <mx:ComboBox id="cardType">       <mx:dataProvider>         <mx:ArrayCollection>           <mx:Array>             <mx:String>American Express</mx:String>             <mx:String>MasterCard</mx:String>             <mx:String>Visa</mx:String>           </mx:Array>         </mx:ArrayCollection>       </mx:dataProvider>     </mx:ComboBox>     <mx:TextInput id="cardNumber" />     <mx:Button click="trace(validator.validate( ))" />   </mx:VBox>   <mx:CreditCardValidator id="validator"                            cardNumberSource="{cardNumber}"                            cardNumberProperty="text"                            cardTypeSource="{cardType}"                            cardTypeProperty="value" /> </mx:Application>