Overrides EntityFormController::submit().
Overrides EntityFormController::submit
public function submit(array $form, array &$form_state) {
// Build the menu link object from the submitted values.
$menu_link = parent::submit($form, $form_state);
// The value of "hidden" is the opposite of the value supplied by the
// "enabled" checkbox.
$menu_link->hidden = (int) (!$menu_link->enabled);
unset($menu_link->enabled);
$menu_link->options['attributes']['title'] = $menu_link->description;
list($menu_link->menu_name, $menu_link->plid) = explode(':', $menu_link->parent);
return $menu_link;
}