code: def add_cxnSp(self, id_, name, type_member, x, y, cx, cy, flipH, flipV):
          
          prst = MSO_CONNECTOR_TYPE.to_xml(type_member)
          cxnSp = CT_Connector.new_cxnSp(
              id_, name, prst, x, y, cx, cy, flipH, flipV
          )
          self.insert_element_before(cxnSp, 'p:extLst')
          return cxnSp
docs: Append a new ``<p:cxnSp>`` shape to the group/shapetree having the
          properties specified in call.