3.16) The groups of buttons.

type gr_grpbut =
  { gb_window : gr_window
  ; mutable gb_top : int
  ; mutable gb_left : int
  ; mutable gb_width : int
  ; mutable gb_height : int
  ; mutable gb_delta : int
  ; mutable gb_btwidth : int
  ; mutable gb_btheight : int
  ; mutable gb_dir : direction
  ; mutable gb_button : int
  ; mutable gb_name : melted_type vect
  ; mutable gb_callback : gr_grpbut -> event -> bool
  }
;;
The object of type gr_grpbut is an area filled with buttons with one pressed and the others released. All the buttons inside the area have the same size, but can display a string, a bitmap, an integer or a boolean.
The type gr_grpbut is the sum of the following variables: The functions linked to the gr_grpbut type are:
gr_draw_grpbut : gr_grpbut -> unit
gr_draw_grpbut Grpbut draws the group of buttons Grpbut.
gr_draw_unfilled_grpbut : gr_grpbut -> unit
gr_draw_unfilled_grpbut Grpbut draws only the outlines of all the buttons of the group of buttons Grpbut.
gr_grpbut_managed : gr_grpbut -> event -> bool
this is the function used by Camlwin to manage the button group objects.