     }
 
     /**
-     * @private
-     * If we are still in the middle of track-scrolling, restart the
-     * timer when the mouse re-enters the track area.
+     *  @private
+     *  If we are still in the middle of track-scrolling, restart the
+     *  timer when the mouse re-enters the track area.
      */
     private function track_rollOverHandler(event:MouseEvent):void
     {

    }

    /**
     * Handle mouse-move events for track scrolling anywhere on the stage
     */
    private function stage_track_mouseMoveHandler(event:MouseEvent):void
    {

    [SkinPart(required="false")]
    
    /**
     *  <code>decrementButton</code> is an optional SkinPart that defines a button 
     *  that, when pressed, will step the scrollbar "up", which is equivalent 
     *  to a decreasing step in the <code>value</code> property.
     */
    public var decrementButton:Button;
    
    [SkinPart(required="false")]
    
    /**
     *  <code>incrementButton</code> is an optional SkinPart that defines a button 
     *  that, when pressed, will step the scrollbar "down", which is equivalent
     *  to a increasing step in the <code>value</code> property.
     */
    public var incrementButton:Button;
    
    //--------------------------------------------------------------------------
    //
    //  Variables
    //
    //--------------------------------------------------------------------------

    // TODO: transient?    
    // Direction indicator for current track-scrolling operations
