gtk-sharp 2.4.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Event data. The event invokes delegates which pass event data via this class. GLib.SignalArgs Constructor Public Constructor. Create a new instance with this constructor if you need to invoke a delegate. Property Gtk.Requisition The width and height this widget would like to have. A Requisition req = args.Requisition; req.Width = 100; req.Height = 200; // NB: You must assign the value back to args.Requisition args.Requisition = req;