WyzbizMainExtension.php

    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $resources = $container->hasParameter('twig.form.resources') ? $container->getParameter('twig.form.resources') : array();
        $resources[] = 'WyzbizMainBundle:Form:fields.html.twig';
        $resources[] = 'WyzbizMainBundle:Form:type_model_list_multiple.html.twig';
        $container->setParameter('twig.form.resources', $resources);

        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('services.xml');
        $this->loadAdminServices($loader);
    }