      *
      *  @see IViewport#contentWidth
      *  @see IViewport#width 
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */
     override protected function viewportContentWidthChangeHandler(event:PropertyChangeEvent):void
     {

     * 
     *  @param thumbPos A number representing the new position of the thumb
     *  button in the control.
     */
    override protected function positionThumb(thumbPos:Number):void
    {


    /**
     *  The size of the track, which equals the width of the track.
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    override protected function get trackSize():Number
    {
