Gtk::Application::create_window() - zombie or not?

[Mateusz Marzantowicz <mmarzantowicz osdf com pl>]

I was recently playing with concept of application in gtkmm. I've done
some class overloading to customize application etc. Then I found in
gtkmm documentation reference to method/function called create_window().
It is mentioned in add_window() method description, but there is no such
method in any base class of Gtk::Application nor in Gtk::Application
class itself. I did some grep over the source code of gtkmm and glibmm
and I get the following result (from gtkmm only):

gtkmm/ChangeLog:3906:    * gtk/src/application.hg: Added create_window().
gtkmm/gtk/src/application.hg:99:   * of Gtk::Application you should call
create_window()

My questions are:
- What for is this function/method used or in what context?
- Should I bother to overload it in my custom Application class (if so how)?
- From where is this function/method called in the gtkmm code?


Thanks,
Mateusz Marzantowicz