      *  @default true
      *  
      *  @langversion 3.0
-     *  @playerversion Flash 10
      *  @playerversion AIR 2.5
      *  @productversion Flex 4.5
      */

     *  Creates an empty navigation stack.
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */

     *  @return Returns true if the screen can be removed
     *  
     *  @langversion 3.0
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
