As I said, I've no idea what the $row array is *meant* to hold... you may need to check the docs for the old functions. Chances are, it'll be something accessible through the $form variable.

If you need it, then *add* something like

$row = array(
  $form[variable][you][need], 
  $form[other][variable][1],
  $form[other][variable][2],
);