Deriving from Gtk::TextBuffer and Gtk::TextTag

[Tamer Mowafy <kalimakhus yahoo com>]

I'd like to derive a class from Gtk::TextBuffer and/or
Gtk::TextTag. The problem is to get an instance of any
of these classes one uses the static member function
create that returns a pointer wrapped in Glib::RefPtr.
This makes me uncertain if it is possible to derive
from these classes in the first place, and if it is
possible what should be the best approach to implement
a corresponding create function for my class that
would return a pointer of the base class type (so it
might be used wherever the base is expected).

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