code: def add_status_line(self, label):
          
          status_line = StatusBar(label,
                                  self._sep_start, self._sep_end,
                                  self._fill_char)
          self._lines.append(status_line)
          return status_line
docs: Add a status bar line to the table.
  
          This function returns the status bar and it can be modified
          from this return value.