Form returned as array not rendered html.

Hai, I tried to implement this on D7. With a patch to allow other modules form rendered in colorbox.
I got array printed on instead of rendered form. Tried with others forms, same results.

$form = drupal_get_form($form_id);
      if (!empty($form)) {
        print $form;
      }

And this

    case 'contact_mail_page':
      module_load_include('inc', 'contact', 'contact.pages');
      print contact_site_page();
      break;

Should be this in D7 :

    case 'contact_mail_page':
      print (drupal_get_form('contact_site_form'));
      break;

Anyone got this array problem? Any solutions or what I did wrong? Thanks.