gtk-sharp 2.6.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. The widget is an abstract class, used only for deriving the subclasses and . Gtk.Widget Constructor Internal constructor Pointer to the C object. This is an internal constructor, and should not be used by user code. Property GLib.GType GType Property. a Returns the native value for . Constructor Protected Constructor. a Chain to this constructor if you have manually registered a native value for your subclass. System.Obsolete(Message=null, IsError=False) Constructor Protected constructor.