code: def loadJSON(self, jdata):
          
          super(ReferenceColumn, self).loadJSON(jdata)
  
          # load additional information
          self.__reference = jdata.get('reference') or self.__reference
          self.__removeAction = jdata.get('removeAction') or self.__removeAction
docs: Loads the given JSON information for this column.
  
          :param jdata: <dict>