<?xml version="1.0" encoding="utf-8"?>
  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
   creationComplete="format()" backgroundColor="#FFFFFF">
  
    <mx:Script>
      <![CDATA[
      import mx.formatters.SwitchSymbolFormatter;                
      
      private function format():void {
              // Create Instance of the SwitchSymbolFormatter and pass in mask character
        var switchSymbolFormatter:SwitchSymbolFormatter = new SwitchSymbolFormatter("*");
        // Apply formatter on the unformatted TextInput data using selectedItem from ComboBox
        formatted.text = switchSymbolFormatter.formatValue(formatString.selectedItem..toString(), unformatted.text);
      }
      ]]>
    </mx:Script>
  
    <mx:Panel title="SwitchSymbolFormatter Example"  width="400" height="200" 
      paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">
  
                  <mx:Form>
        <mx:FormItem label="Unformatted Data:">
          <mx:TextInput id="unformatted" text="123456789" editable="false"/>
        </mx:FormItem>
        <mx:FormItem label="Format String:">
          <mx:ComboBox id="formatString" change="format()">
            <mx:ArrayCollection>
              <mx:String># *-********</mx:String>
              <mx:String># ***-******</mx:String>
              <mx:String># **-***-****</mx:String>
              <mx:String># *******-**</mx:String>
          </mx:ArrayCollection>
        </mx:ComboBox>
        </mx:FormItem>
        <mx:FormItem label="Formatted Data:">
          <mx:TextInput id="formatted" editable="false"/>
        </mx:FormItem>       
      </mx:Form>
      </mx:Panel>
  </mx:Application>