code: def _add_graphicFrame_containing_table(self, rows, cols, x, y, cx, cy):
          
          _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
docs: Return a newly added ``<p:graphicFrame>`` element containing a table
          as specified by the parameters.