Ok, I get it (or: Gtk+ is better than I thought).
In my last post, I kinda whined about the awkwardness of the Gtkmm API. At least, it seemed that way at the time. I toyed with libglade and Gtk+ for a while first and everything seemed very straightforward and easy. Gtkmm and libglademm are different. They seemed awkward at first, but after further investigation, I [...]