Changing the Class for one Object instance only

[murrayc t-online de (Murray Cumming)]

I guess that, for instance, 2 GtkButton instances would share the same
GtkButtonClass instance. So is there any way for me to change the
callbacks for one GtkButton without changing them for the other?

Note that this is after instantiation time. Actually, it's just before
disposal time, so that the GTK+ callbacks can still be called during the
GTK+ not-really-destroyed state after the gtkmm C++ instance has been
deleted.

-- 
Murray Cumming
murrayc usa net
www.murrayc.com