gtk-sharpGtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details.GLib.SignalArgsEvent data.The event invokes delegates which pass event data via this class.ConstructorPublic Constructor.Create a new instance with this constructor if you need to invoke a delegate.PropertyGtk.WidgetThe notebook page being switched to.A PropertySystem.UInt32The page number being switched to.A