MDI applications in gtk?

[Antonio Campos <acampos ceronet com>]

My question is if it is possible to do MDI applications with a GTK
application.
I mean if I can put a TOP_LEVEL_WINDOW into a TOP_LEVEL_WINDOW.
I don't like the sheets method for having multiple windows inside an
application.
I find more user-friendly to have multiple windows inside a TOP_LEVEL
one.
It would be nice if I could do a
gtk_widget_add(GTK_WINDOW_TOPLEVEL(window2),GTK_WINDOW_MDI(window1)),
and
that the widget window1 (parent of window2) would manage the child
window (window1).
Any way of doing this in GTK?.
Any future plans about this if not?.