Make row 4 use yellow borders.
if rownum eq 4 then do;
  alist = makelist();
  alist = setnitemc(alist, 'N', 
                   'LABEL_BUTTONS');
  call send(viewerid, '_setAttributes', 
            alist);
  call send(rcdvecid, '_setBorderColor',
           'ALL', 'YELLOW');
  call send(rcdvecid, '_setBorderWidth',
          'ALL', 0.1, 'in');
end;