gtk-sharp Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Gtk.Separator The is a vertical separator, used to group the widgets within a window. The is a vertical separator, used to group the widgets within a window. It displays a vertical line with a shadow to make it appear sunken into the interface. Constructor Constructor. Constructor Pointer to the C object. Internal constructor This is an internal constructor, and should not be used by user code. Property GLib.GType GType Property. a Returns the native value for .