def __init__(self, label, icon=None, link=None, queryset=None, model=None, order=None):
    self._label = label
    self._icon = icon
    self._link = link
    self._queryset = queryset
    self._model = model
    self._order = (order or 99)
    self.__class__._registry.append(self)
def __init__(self, label, icon=None, link=None, queryset=None, model=None, order=None):
    self._label = label
    self._icon = icon
    self._link = link
    self._queryset = queryset
    self._model = model
    self._order = (order or 99)
    self.__class__._registry.append(self)