     //---------------------------------
     
     /**
+     *  @private
      *  Handle mouse-down events for the scroll track. Subclasses
      *  should override this method if they want the track to
      *  recognize mouse clicks on the track.

    [SkinPart]
    
    /**
     *  <code>track</code> is a SkinPart that defines a button
     *  that, when  pressed, will set the <code>value</code>
     *  to the value corresponding with that position.
     */
    public var track:FxButton; 


    private var _thumbSize:Number = 0;
    
    /**
     *  The size of the thumb button on the logical track in the 
     *  units of the subclass, which must be consistent with 
     *  <code>trackSize</code> property, and with 
     *  the <code>pointToPosition()</code> and <code>valueToPosition()</code> methods. 
     * 
     *  @default 0
     */
