def LoadData(self, data, custom_properties=None):
self.__data = []<EOL>self.AppendData(data, custom_properties)<EOL>
Loads new rows to the data table, clearing existing rows.

        May also set the custom_properties for the added rows. The given custom
        properties dictionary specifies the dictionary that will be used for *all*
        given rows.

        Args:
          data: The rows that the table will contain.
          custom_properties: A dictionary of string to string to set as the custom
                             properties for all rows.