Non blocking dialog window

Hello,

I'm trying this in order to get a non blocking message dialog:

.            info = gtk.MessageDialog(
.                    parent = None,
.                    type = gtk.MESSAGE_INFO,
.                    message_format = _('Updating the list of the nodes'))
.            info.show()
.            do_hairy_computation()
.            info.destroy()

But it doesn't seem to work since I cannot see the dialog appearing.
As I understand the documentation in:

   http://www.pygtk.org/pygtk2reference/class-gtkdialog.html
   
When one use run(), the dialog is displayed in blocking mode so I inferred
that when one use show() the window is displayed in non blocking mode.

I suspected this might because the computation is finished too quickly
so I added some sleep calls but without success.

Any hints ?

--
(°>  Nicolas Évrard
/ )  Liège - Belgique
^^
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