def property(self, key, default=None):
        """
        Returns the custom data that is stored on this object.
        
        :param      key     | <str>
                    default | <variant>
        
        :return     <variant>
        """
        if key == 'Name':
            return self.name()
        elif key == 'Start':
            return self.dateStart()
        elif key == 'End':
            return self.dateEnd()
        elif key == 'Calendar Days':
            return self.duration()
        elif key == 'Work Days':
            return self.weekdays()
        elif key == 'Time Start':
            return self.timeStart()
        elif key == 'Time End':
            return self.timeEnd()
        elif key == 'All Day':
            return self.isAllDay()
        else:
            return self._properties.get(nativestring(key), default)