public ProductListView() {
Stetic.Gui.Build(this, typeof(InvoiceSharp.ProductListView));
productsView.Model = new Gtk.ListStore(typeof(string), typeof(int), typeof(double));
productsView.AppendColumn("Produkt", new Gtk.CellRendererText());
productsView.AppendColumn("Ilość", new Gtk.CellRendererSpin());
Gtk.CellRendererSpin s = new Gtk.CellRendererSpin();
s.Digits=2;
productsView.AppendColumn("Cena", s);
(productsView.Model as Gtk.ListStore).AppendValues("abc", 5, 2.03);
}