code: def get_slot_header(self, item):
          
          obj = item["obj"]
          obj = api.get_object(obj)
  
          # Prepare the template data
          data = {
              "obj": obj,
              "item": item,
              "position": item["Pos"],
          }
          # update the data
          data.update(self.get_slot_header_data(obj))
  
          template = ViewPageTemplateFile("../templates/slot_header.pt")
          return template(self, data=data)
docs: Generates a slot header (the first cell of the row) for the item
  
          :param item: the item for which the slot header is requested
          :return: the html contents to be displayed in the first cell of a slot