[Gtk-sharp-list] The GtkCombo

[Kaoe Coito]

	Hello

	As I make to add itens to combo in runtime?

	I use:

	 Glade.XML gxml = new
Glade.XML(null,"resource/saturno.glade","formUsuarios",null);

                        formusuarios = (Window)gxml["formUsuarios"];
                        Combo cb = (Combo)gxml["combo1"];

                        listUsuarios = (Container)gxml["listUsuarios"];

			Item op1 = new Item(IntPtr.Zero);
			listUsuarios.Add(op1);

	This return error!