  *  the portion of data that is displayed when there is too much data
  *  to fit horizontally in a display area.
  * 
- *  <p>This control extends the base ScrollBar control.</p> 
- *  
  *  <p>Although you can use the FxHScrollBar control as a stand-alone control,
  *  you usually combine it as part of another group of components to
  *  provide scrolling functionality.</p>

    }
    
    /**
     *  If viewport is non null then ask it to compute the horizontal
     *  scroll position delta for step up/down.  The delta is added
     *  to this scrollbar's value.  
     * 
     *  @see viewport
     *  @see #setValue
     *  @see IViewport#horizontalScrollPositionDelta
     */
    override public function step(increase:Boolean = true):void
    {

            var trackPos:Number = track ? track.x : 0;   
            var layoutItem:ILayoutItem = LayoutItemFactory.getLayoutItemFor(thumb);
            layoutItem.setActualPosition(Math.round(trackPos + thumbPos),
                                         layoutItem.actualPosition.y);
        }
    }
    
