-- Command: space BAR/S, HORIZ/S, VALUE
     This object will place some white space into the current location.
     A consequence of placing space is that the window will be sizable
     in the associated direction. The arguments are optional.

        * BAR [I..] - if this switch is given then a bar will be
          rendered in the center of the space.

        * HORIZ [I..] - if this switch is given then the space will be a
          horizontal space (best used within a horizontal group)
          otherwise the space will be vertical.

        * VALUE [I..] - this argument, if given, specifies the minimum
          amount of space.  The default value is zero.

     Example use of this command:

          window
              .
              .
              .
              group HORIZ
                  button LABEL 'OK'
                  space BAR 0
                  button LABEL 'Cancel'
              endgroup
          endwindow