Create a RadioButtonGroup and put RadioButton into it

       
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"
  backgroundColor="#eeeeee">
  
  <mx:Script>
    
      import mx.controls.Alert;
      private function checkSelected():void
      {
        Alert.show(String(buttonGroup.selectedValue));
      }
  
  </mx:Script>
  
  <mx:RadioButtonGroup id="buttonGroup"/>
  <mx:VBox>
    <mx:RadioButton value="Small" label="Small" groupName="buttonGroup"/>
    <mx:RadioButton value="Medium" label="Medium" groupName="buttonGroup"/>
    <mx:RadioButton value="Large" label="Large" groupName="buttonGroup"/>
  </mx:VBox>

  <mx:Button label="Check status" click="checkSelected()"/>
</mx:Application>

1.	Add RadioButton to RadioButtonGroup
2.	RadioButton click event
3.	RadioButton default value
4.	Define RadioButton control with
5.	Create RadioButton group using the RadioButtonGroup control
6.	Bind bindable variable to RadioButton
7.	Bind RadioButton to Model
8.	and three
9.	Change Image value by using RadioButton
10.	Use radio button to change state
11.	Use style to change font size and weight for RadioButton and Label
12.	RadioButton with group name

Create a RadioButtonGroup and put RadioButton into it : RadioButton « Components « Flex

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