Changing Border Top Shadow Color

  Window border top and bottom shadow colors have to be
  well-matched to present the three-dimensional look of
  DECwindows Motif.  DECwindows helps you to do this by
  automatically determining top and bottom shadow border
  colors when you change the background color.  This option is
  indicated by the shaded Automatic shadow check button.

  To choose your own top shadow colors:

  1.  Click on the Automatic shadow check button.

      This option will be disabled.

  2.  Click on the Top Shadow button.
      DECwindows displays the Color Mixing dialog box, which
      lets you select the Top Shadow color you want.  You
      should use the HLS model in the color mixing dialog
      box to choose a top shadow color that is lighter and less
      saturated than the background color.