void gtk_window_set_titlebar ( GtkWindow* window, GtkWidget* titlebar )
Sets a custom titlebar for
A typical widget used here is
GtkHeaderBar, as it
provides various features expected of a titlebar while allowing
the addition of child widgets to it.
If you set a custom titlebar, GTK will do its best to convince
the window manager not to put its own titlebar on the window.
Depending on the system, this function may not work for a window
that is already visible, so you set the titlebar before calling
The widget to use as titlebar.
The argument can be
The data is owned by the caller of the function.