[gtkmm] Fullscreen+set_transient_for+Fedora

[Igor Gorbounov <igorbounov voronezh serw ru>]

Hi, All!
Early, on RedHat 9, windows (normal windows, no dialogs), that
were set transient for a fullscreened parent window, were placed
on top of that window.
And now, on Fedora Core 1, their behavior has changed: all my
transient windows are hiding itselves under their parent window -
is that normal. I mean, they behave themselves just like it was
disigned by developers of gtk (and gtkmm) or am I missing something?
Anyway, is there a reliable method for placing non-dialog
daughter windows above their parent window?
	Hopefully,
	Igor Gorbounov