Ctor / init handling? new Gtk.ListStore (2, typeof (string), typeof (int)); syntax is no_cols, ..... -- list of colum types.. ?? this might need a Helper? Better handling of Packing .. normal pack is done by pack: add,a,b,c -> results in parent.el.pack(child,a,b,c) ?? might need a Helper to offer standards on this? pack.type = add pack.{arg} = ...