  *  @playerversion AIR 1.5
  *  @productversion Flex 4
  */
-public class FxScrollBar extends FxTrackBase
+public class ScrollBar extends TrackBase
 {
     include "../../core/Version.as";
 

import flash.events.TimerEvent;
import flash.geom.Point;
import flash.utils.Timer;
import mx.components.FxButton;
import mx.core.IViewport;
import mx.events.PropertyChangeEvent;
import mx.events.ResizeEvent;


[Style(name="symbolColor", type="uint", format="Color", inherit="yes")]

/**
 *  The ScrollBar class helps to position
 *  the portion of data that is displayed when there is too much data
 *  to fit in a display area. 
 *  The ScrollBar class displays a pair of scrollbars and a viewport. 
 *  A viewport is a UIComponent that implements IViewport, such as Group.
 *  
 *  <p>This control extends the TrackBase class and
 *  is the base class for the HScrollBar and VScrollBar
 *  controls.</p> 
 * 
 *  <p>A scroll bar consists of a track, a variable-size scroll thumb, and 
 *  two optional arrow buttons. The ScrollBar class uses four parameters 
 *  to calculate its display state:</p>
 *
 *  <ul>
