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Data Validation Through Events

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:CurrencyValidator source="{currencyUS}"                            property="text"                           alignSymbol="left"                            trigger="{validateButton}"                            triggerEvent="click" />     <mx:Panel title="Validation through Events" horizontalAlign="center">         <mx:Label text="Enter a US-formatted number:" />         <mx:TextInput id="currencyUS" />         <mx:Button label="Do It" id="validateButton" />     </mx:Panel> </mx:Application>