code: def __create_list_item_widget(self, ui, calibration_observable):
          
          calibration_row = make_calibration_row_widget(ui, calibration_observable)
          column = ui.create_column_widget()
          column.add_spacing(4)
          column.add(calibration_row)
          return column
docs: Called when an item (calibration_observable) is inserted into the list widget. Returns a widget.