Return a newly added ``<p:graphicFrame>`` element containing a table
        as specified by the parameters.

def _add_graphicFrame_containing_table(self, rows, cols, x, y, cx, cy):
        """
        Return a newly added ``<p:graphicFrame>`` element containing a table
        as specified by the parameters.
        """
        _id = self._next_shape_id
        name = 'Table %d' % (_id-1)
        graphicFrame = self._spTree.add_table(
            _id, name, rows, cols, x, y, cx, cy
        )
        return graphicFrame