<?xml version="1.0"?>
  <!-- Simple example to demonstrate RadioButton control. -->
  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  
      <mx:Script>
          import mx.controls.Alert;
      </mx:Script>
  
      <mx:Panel title="RadioButton Control Example" height="75%" width="75%" 
          paddingTop="10" paddingLeft="10" paddingRight="10">
  
         <mx:Label width="100%" color="blue"
             text="What year were women first allowed to compete in the Boston Marathon?"/>
  
          <mx:RadioButton groupName="year" id="option1" label="1942"/>
          <mx:RadioButton groupName="year" id="option2" label="1952"/>
          <mx:RadioButton groupName="year" id="option3" label="1962"/>
          <mx:RadioButton groupName="year" id="option4" label="1972"/>
  
          <mx:Button label="Check Answer" 
              click="Alert.show(option4.selected?'Correct Answer!':'Wrong Answer', 'Result')"/>
      
      </mx:Panel>
  </mx:Application>