Make row 3, column 3 use yellow borders.
if rownum eq 3 then do;
  call send(gddvecid, '_setIndex', 3);
  call send(gddvecid, '_setBorderColor',
            'ALL', 'YELLOW');
  call send(gddvecid, '_setBorderWidth',
           'ALL', 0.1, 'in');
end;