      * 
      *  @param thumbPos A number representing the new position of the thumb
      *  button in the control.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */
     override protected function positionThumb(thumbPos:Number):void
     {

     *  @see mx.core.IViewport
     *  @see mx.core.IViewport#verticalScrollPosition
     *  @see mx.core.IViewport#getVerticalScrollPositionDelta()     
    */
    override public function page(increase:Boolean = true):void
    {

     *  verticalScrollPosition.
     * 
     *  @see IViewport#verticalScrollPosition
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    override protected function viewportVerticalScrollPositionChangeHandler(event:PropertyChangeEvent):void
    {
