itemClick event for group tells which button was selected

        
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.controls.Alert;
        import mx.events.ItemClickEvent;
        private function handleCard(event:ItemClickEvent):void {
            if (event.currentTarget.selectedValue == "AmEx") {
                Alert.show("American Express")
            } else {
                if (event.currentTarget.selectedValue == "MC") {
                    Alert.show("Master Card")
                } else {
                    Alert.show("Visa")
                }
            }
        }
      
    </mx:Script>
    <mx:RadioButtonGroup id="cardtype" itemClick="handleCard(event);" />
    <mx:RadioButton groupName="cardtype" id="americanExpress" value="AmEx" label="American Express" width="150" />
    <mx:RadioButton groupName="cardtype" id="masterCard" value="MC" label="MasterCard" width="150" />
    <mx:RadioButton groupName="cardtype" id="visa" value="Visa" label="Visa" width="150" />
</mx:Application>

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itemClick event for group tells which button was selected : Button Event « Components « Flex

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