code: def assignOrderNames(self):
          
          try:
              schema = self.tableType().schema()
          except AttributeError:
              return
          
          for colname in self.columns():
              column = schema.column(colname)
              if column:
                  self.setColumnOrderName(colname, column.name())
docs: Assigns the order names for this tree based on the name of the
          columns.