  *  @eventType mx.events.FlexEvent.NAVIGATOR_STATE_SAVING
  *  
  *  @langversion 3.0
- *  @playerversion Flash 10
  *  @playerversion AIR 2.5
  *  @productversion Flex 4.5
  */

     *  @param event The InvokeEvent object.
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */  

     *  exit when the back key is pressed.
     *
     *  @langversion 3.0
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */ 
