Rendering panelizer programmatically

gistfile1.php

module_load_include('inc', 'page_manager', 'plugins/tasks/node_view');
// Set page manager to standard, prevents ipe conflicts.
$entity[$entity_key[0]]->panelizer['page_manager']->pipeline = "standard";
$pm = &$entity[$entity_key[0]]->panelizer['page_manager'];

// Page tabs have wrong links, better to disable them.
foreach ($pm->display->content as &$content) {
  if ($content->type == 'page_tabs') {
    $content->shown = FALSE;
  }
}
$page_manager = page_manager_node_view_page($entity[$entity_key[0]]);