code: def new_textbox_sp(id_, name, left, top, width, height):
          
          tmpl = CT_Shape._textbox_sp_tmpl()
          xml = tmpl % (id_, name, left, top, width, height)
          sp = parse_xml(xml)
          return sp
docs: Return a new ``<p:sp>`` element tree configured as a base textbox
          shape.