Initializing libgnomedbmm

In addition to instantiating the regular Gtk::Main instance in your main() function, you should also initialize libgnomedbmm by calling Gnome::Db::init(). For instance:

int main(int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);
  Gnome::Db::init("Example", "0.0.1", argc, argv);
  
  ...;
}