How to keep a Window always in the forground

[günther <guenther rapp-informatik de>]

Hallo does GTK have a function to keep a popup or dialog window always
in the
forground of the Desktop. 
The problem making such window modal the parent window can not become an
focus as well.
But clicking in this window it will become an active one on the desktop
and may can hide
the dialog window. So a user may search the dialog window an can not
find because of behind
his modal main window.

Best Regards
Günther
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