Submit handler for configing group settings on a view.
function views_ui_config_item_group_form_submit($form, &$form_state) {
$item =& $form_state['handler']->options;
$type = $form_state['type'];
$id = $form_state['id'];
$handler = views_get_handler($item['table'], $item['field'], $type);
$handler
->init($form_state['view']
->get('executable'), $item);
$handler
->submitGroupByForm($form, $form_state);
// Store the item back on the view
$form_state['view']
->get('executable')
->setItem($form_state['display_id'], $form_state['type'], $form_state['id'], $item);
// Write to cache
views_ui_cache_set($form_state['view']);
}