Attaching callback to adjustment object created by glade

["Rod B. Nussbaumer" <bomr trmail triumf ca>]

GTK+ gurus:

1. Newbie question here.

2. I'm using glade 0.5.5 & 0.59 on a couple of different Linux hosts.
C language output.  Trying to make sliders generate callbacks when
the user operates them.

3. The actual question.  How can I attach a callback to an adjustment
object that is part of a widget.  Especially, I'd like to be able to
do this in a way that my code doesn't get clobbered when I regenerate
the code with glade.  I can't see any hooks in the API to get a reference 
to an adjustment object that is contained in an existing widget.  The
adjustment objects seem to be created at run-time in the module (created 
by glade) that generates all of the widgets.  If I modify this code 
module, my edits will be lost each time the code gets regurgitated by
glade.  I guess I'm looking for a function something like:

gtk_hscale_get_adjustment( GtkWidget * MyHscale, GtkAdjustment * MyHscaleAdjustment );

        ... so I can use the Adjustemnt reference to attach a callback
to it that will fire when the user moves the specified slider.

Hope this is making sense.  Thanks.

        ---   rod.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Rod Nussbaumer, Programmer/Technologist    E-mail: bomr triumf ca  
 TRIUMF --- University of British Columbia,  Phone: (604)222-7449
 Vancouver, BC, Canada.                        FAX: (604)222-7307
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~