Deriving from a Gtkmm widget

[brian <bmcandrews gmail com>]

I want to derive from a Gtk::HBox , the new widget can contain widgets
that are themselves containers.  What methods should(have to)
override?

on_add() ?
on_remove()?
child_type_vfunc() ?
forall_vfunc() ?

can I just use the container add() and will the other sub-containers
get notified of events?

Thanks,
Brian