gistfile1.txt

/* Full Version */
$view->set_display($display_id);
$view->init_handlers();
 
$view->set_exposed_input($exposed_filters);
 
$exposed_form_state = array(
    'view' => &$view,
    'display' => &$view->display[$display_id],
    'exposed_form_plugin' => $view->display_handler->get_plugin('exposed_form'),
    'method' => 'get',
    'rerender' => TRUE,
    'no_redirect' => TRUE,
    'always_process' => TRUE,
);
$form = drupal_build_form('views_exposed_form', $exposed_form_state);
$rendered_form = render($form);

/* Markup Version */
$view = $instance['#view'];
$display_id = 'panel_pane_1';

$view->set_display($display_id);
$view->init_handlers();
$view->set_exposed_input($exposed_filters);

$exposed_form = $view->display_handler->get_plugin('exposed_form');
$rendered_form = $exposed_form->render_exposed_form(true);