[development] Help with form in drupal, 7

[Fernando Correa da Conceição]

I am updating a draggable form from drupal 6 to 7. If i change the value 
of weight on the select box, it changes and saves it, but if i drag and 
drop, it do not change the value. I found some samples, but they are 
only for drupal 6, where it works, i have made some changes from drupal 
6 and it is as this, the full file is at 
http://drupalcode.org/viewvc/drupal/contributions/modules/customfilter/customfilter.module?view=markup&pathrev=DRUPAL-7--1 

This is the only thing left to a drupal 7 version, and any help/tip is 
welcome, thanks.

function theme_customfilter_rules_form($vars) {
  $form = $vars['form'];
  $rows = array();
  if (isset($form['rules'])) {
    foreach (element_children($form['rules']) as $rid) {
      $row = array();

      $element = &$form['rules'][$rid];

      $element['prid']['#attributes']['class'] = 'rule-prid';
      $element['rid']['#attributes']['class'] = 'rule-rid';
      $element['weight']['#attributes']['class'] = 'rule-weight';

      $row[] = (
        // @todo Fix this for indentation
        //theme('indentation', $element['level']['#value']) .
        $element['name']['#value']
      );

      $row[] = (
        drupal_render($element['rid']) .
        drupal_render($element['prid']) .
        drupal_render($element['weight'])
      );
      $row[] = drupal_render($element['enabled']);
      $row[] = $element['operations']['add']['#value'];
      $row[] = $element['operations']['edit']['#value'];
      $row[] = $element['operations']['delete']['#value'];

      $rows[] = array(
        'data' => $row,
        'class' => array('draggable'),
      );
    }
  }

  if (!count($rows)) {
    $rows[] = array(
      array(
        'data' => t('There are no replacement rules currently defined.'),
        'colspan' => '6',
      )
    );
  }

  $header[] = t('Name');
  $header[] = t('Weight');
  $header[] = t('Enabled');
  $header[] = array(
    'data' => t('Operations'),
    'colspan' => '3',
  );

  drupal_add_tabledrag('customfilter-rules-tree', 'order', 'sibling', 
'rule-weight', NULL, NULL, TRUE);
  drupal_add_tabledrag('customfilter-rules-tree', 'match', 'parent', 
'rule-prid', 'rule-prid', 'rule-rid', TRUE);

  $args['header'] = $header;
  $args['rows'] = $rows;
  $args['attributes'] = array('id' => 'customfilter-rules-tree');
  return theme_table($args) .// theme($form);
    drupal_render_children($form);
}