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