code: def clearAll(self):
          
          # clear the tree information
          self.clear()
          
          # clear table information
          self._tableTypeName  = ''
          self._tableType      = None
          
          # clear the records information
          self._recordSet         = None
          self._currentRecordSet  = None
          
          # clear lookup information
          self._query             = None
          self._order             = None
          self._groupBy           = None
          
          # clear paging information
          
          if not self.signalsBlocked():
              self.recordsChanged.emit()
docs: Clears the tree and record information.