LeftMenu::expandMenuGroupAction

public function expandMenuGroupAction($id)
{
	$groups = CUserOptions::GetOption('intranet', 'left_menu_groups_' . SITE_ID);
	$groups = is_array($groups) ? $groups : [];
	$groups[$id] = 'expanded';
	CUserOptions::SetOption('intranet', 'left_menu_groups_' . SITE_ID, $groups);
}