docs: def get(self, name_or_klass):
          """
          Gets a specific panel instance.
  
          :param name_or_klass: Name or class of the panel to retrieve.
          :return: The specified panel instance.
          """
          if not isinstance(name_or_klass, str):
              name_or_klass = name_or_klass.__name__
          for zone in range(4):
              try:
                  panel = self._panels[zone][name_or_klass]
              except KeyError:
                  pass
              else:
                  return panel
          raise KeyError(name_or_klass)