'Set the alignment for multiple lines layout.  The layout of the
bounding box of all the lines is determined bu the horizontalalignment
and verticalalignment properties, but the multiline text within that
box can be
ACCEPTS: [\'left\' | \'right\' | \'center\' ]'

def set_multialignment(self, align):

    legal = (u'center', u'right', u'left')
    if (align not in legal):
        raise ValueError((u'Horizontal    alignment    must    be    one    of    %s' % str(legal)))
    self._multialignment = align
    self.stale = True
