On Fri, Nov 02, 2007 at 05:48:01PM -0500, Angela Zhu wrote:
> Can anyone give me an example how to set a GButton.button to be
> insensitive or not according to a boolean value "isActive"?

The method #misc#set_sensitive, used by a few examples
in the sources of LablGTK, and documented here:
  http://plus.kaist.ac.kr/~shoh/ocaml/lablgtk2/lablgtk-2.4.0/doc/html/GObj.misc_ops.html#METHODset_sensitive
may do the job:

% cat test.ml
let _ =
    let window = GWindow.window ()
      ~show: true in
    let button = GButton.button ()
      ~label: "hello"
      ~packing: window#add in
    let isActive = false in
    button#misc#set_sensitive isActive;
    ignore (window#connect#destroy
      ~callback: GMain.quit);
    GMain.main ()

% ocamlc -o test -I +lablgtk2 lablgtk.cma gtkInit.cmo test.ml
% ./test

HTH,
  Julien.