gdk-sharp 2.6.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Specifies the visiblity status of a window for a . System.Enum GLib.GType(WrapperType=typeof(Gdk.VisibilityStateGType)) Field Gdk.VisibilityState The window is completely visible. Field Gdk.VisibilityState The window is partially visible. Field Gdk.VisibilityState The window is not visible at all.