A widget which is not displayed
Methods and Functions
GObject +----GInitiallyUnowned +----GtkObject +----GtkWidget +----GtkInvisible
GtkInvisible widget is used internally in GTK+, and is probably not
very useful for application developers. It is used for reliable pointer grabs and selection handling in the code
gtkInvisible is the result of collapsing the constructors of
gtkInvisibleNewForScreen) and accepts a subset of its arguments matching the required arguments of one of its delegate constructors.