Append a new ``<p:cxnSp>`` shape to the group/shapetree having the
        properties specified in call.

def add_cxnSp(self, id_, name, type_member, x, y, cx, cy, flipH, flipV):
        """
        Append a new ``<p:cxnSp>`` shape to the group/shapetree having the
        properties specified in call.
        """
        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