code: def selected_display_item(self) -> typing.Optional[DisplayItem.DisplayItem]:
          
          # first check for the [focused] data browser
          display_item = self.focused_display_item
          if not display_item:
              selected_display_panel = self.selected_display_panel
              display_item = selected_display_panel.display_item if selected_display_panel else None
          return display_item
docs: Return the selected display item.
  
          The selected display is the display ite that has keyboard focus in the data panel or a display panel.