@property
def entity_zero_or_selectable(self):
    for ent in self._entities:
        ezero = ent.entity_zero_or_selectable
        if (ezero is not None):
            return ezero
    else:
        return None
@property
def entity_zero_or_selectable(self):
    for ent in self._entities:
        ezero = ent.entity_zero_or_selectable
        if (ezero is not None):
            return ezero
    else:
        return None