public function getGridOptions(): array
    {
        $collection = GridModel::findAll(['order' => 'tl_bs_grid.title']);
        $options    = [];

        if ($collection) {
            foreach ($collection as $model) {
                $parent = sprintf(
                    '%s [ID %s]',
                    $model->getRelated('pid')->name,
                    $model->pid
                );

                $options[$parent][$model->id] = sprintf('%s [ID %s]', $model->title, $model->id);
            }
        }

        return $options;
    }