# File gtk/sample/gtk-demo/editable_cells.rb, line 134
    def   cell_editedcell_editedcell_edited(cell, path_string, new_text, model)
      path = Gtk::TreePath.new(path_string)

      column = cell.column

      iter = model.get_iter(path)
      case column
      when COLUMN_NUMBER
        i = iter.path.indices[0]
        @articles[i].number = new_text.to_i
        iter.set_value(column, @articles[i].number)
      when COLUMN_PRODUCT
        i = iter.path.indices[0]
        @articles[i].product = new_text
        iter.set_value(column, @articles[i].product)
      end
    end