Make row 4, column 2 use dashed borders.
if rownum eq 4 then do;
  call send(gddvecid, '_setIndex', 2);
  call send(gddvecid, '_setBorderStyle', 
            'ALL', 'DASHED');
  call send(gddvecid, '_setBorderWidth',
            'ALL', 0.1, 'in');
end;