def vr_row(iter)
      unless iter.respond_to?(:id)
        iter.extend(IterMethods)
        iter.column_keys = @column_keys
      end
      return iter
    end
def vr_row(iter)
      unless iter.respond_to?(:id)
        iter.extend(IterMethods)
        iter.column_keys = @column_keys
      end
      return iter
    end
Converts a normal GtkTreeIter to use VR's column IDs.  You can use it like this:

   row = @view.vr_row(iter)   # iter is a Gtk::TreeIter
   row[:name] = "Chester"  # works!