gtkmm equivalent of ->get_window()

[Jeff Simpson <llcooljeff gmail com>]

I realized yesterday that I was writing GTK code and not gtkmm code.
So now I'm converting all my GtkDrawingArea to Gtk::DrawingArea and
GdkPixmap to Gdk::Pixmap.

I need a way to get a Gdk::Drawable out of an on-screen object
(specifically a Gtk::DrawingArea). Before I was using get_window() and
calling the resulting GdkWindow a GdkDrawable. I no longer have that
get_window() function, but I assume there must be some other way to
get the underlying drawable window for a gtk widget?

Thanks!

 - Jeff
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