$objects = $modx->getCollection('modResource', [
        'deleted'   => 0,
        'published' => 1,
        'hidemenu'  => 0,
        'parent'    => $modx->resource->get('id')
    ]);

    $items = [];
    foreach ($objects as $object) {
        $items[] = $object->get('pagetitle') . '==' . $object->get('id');
    }

    return implode('||', $items);

@EVAL return '-- Выберите --||' . $modx->runSnippet('snptName');