Hi! If you want to make your life easier, while debugging you change: // Recurse through all child elements. $count = 0; foreach (element_children($form) as $key) { to // Recurse through all child elements. $count = 0; foreach (element_children($form) as $key) { if (!is_array($form[$key])) die "the form has a wrong key $key"; this way, if you miss a # from a property name, you will get some immediate feedback. As it harms performance a bit and is not something that can happen with a 'ready' site, I see no point in adding this in any way to form.inc. If someone has an idea on where to add this to some docs, do so. Regards NK