Comment by jandrese

Couldn't you just make your own macros?

    #define GtkHBox(x) GtkBox(x, GTK_ORIENTATION_HORIZONTAL)
    #define GtkVBox(x) GtkBox(x, GTK_ORIENTATION_VERTICAL)

I thought the change to a standard GtkBox made sense given the way the system was built. This made both kinds of boxes the same class, avoiding an unnecessary layer of inheritance.