Replaces the default, usually yellow, window used for displaying
tooltips with custom_window. GTK+ will take care of showing and
hiding custom_window at the right moment, to behave likewise as
the default tooltip window. If custom_window is NULL, the default
tooltip window will be used.
If the custom window should have the default theming it needs to
have the name "gtk-tooltip", see gtk_widget_set_name().
Since 2.12
Replaces the default, usually yellow, window used for displaying tooltips with custom_window. GTK+ will take care of showing and hiding custom_window at the right moment, to behave likewise as the default tooltip window. If custom_window is NULL, the default tooltip window will be used. If the custom window should have the default theming it needs to have the name "gtk-tooltip", see gtk_widget_set_name(). Since 2.12