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To set functionality such as a single event handler on the group, use the s

tag" src="http://www.rntsoft.com/Code/FlexImages/TosetfunctionalitysuchasasingleeventhandleronthegroupusethesRadioButtonGrouptag.PNG"          <!-- Code from Flex 4 Documentation "Using Adobe Flex 4". This user guide is licensed for use under the terms of the Creative Commons Attribution  Non-Commercial 3.0 License.  This License allows users to copy, distribute, and transmit the user guide for noncommercial  purposes only so long as    (1) proper attribution to Adobe is given as the owner of the user guide; and    (2) any reuse or distribution of the user guide contains a notice that use of the user guide is governed by these terms.  The best way to provide notice is to include the following link.  To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ --> <!-- controls\button\RBGroupSimple.mxml --> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"     xmlns:s="library://ns.adobe.com/flex/spark"     xmlns:mx="library://ns.adobe.com/flex/mx">     <fx:Script>                   import mx.events.ItemClickEvent;          private function handleCard(event:ItemClickEvent):void {              //Print the value of the selected RadioButton in the Text Area              var cardValue:Object = cardtype.selectedValue;              myTA.text="You selected " + cardValue;          }             </fx:Script>     <fx:Declarations>         <s:RadioButtonGroup id="cardtype" itemClick="handleCard(event);" />     </fx:Declarations>     <s:VGroup>         <s:RadioButton group="{cardtype}" id="americanExpress"             label="American Express" width="150" />         <s:RadioButton group="{cardtype}" id="masterCard" label="MasterCard"             width="150" />         <s:RadioButton group="{cardtype}" id="visa" label="Visa" width="150" />         <s:TextArea id="myTA" />     </s:VGroup> </s:Application>