SET(SCROLL_BAR_AUTO_THUMB)

  Enables or disables automatic adjustment of the scroll bar slider.

  Syntax

     SET (SCROLL_BAR_AUTO_THUMB, window, {HORIZONTAL | VERTICAL},
          {ON | OFF})

  Parameters

     SCROLL_BAR_AUTO_THUMB A keyword directing TPU to enable or disable
                          automatic adjustment of a scroll bar slider in a
                          TPU window.

     window               The window whose scroll bar slider you want TPU
                          to adjust.

     HORIZONTAL           A keyword directing TPU to set the slider on a
                          horizontal scroll bar.

     VERTICAL             A keyword directing TPU to set the slider on a
                          vertical scroll bar.

     ON                   A keyword directing TPU to enable automatic
                          adjustment of the scroll bar slider.

     OFF                  A keyword directing TPU to disable automatic
                          adjustment of the scroll bar slider.