protected function deleteCollection()
    {
        $this->controlAccess('collection_delete');

        if ($this->collection->delete($this->data_collection['collection_id'])) {
            $this->redirect('admin/content/collection', $this->text('Collection has been deleted'), 'success');
        }

        $this->redirect('', $this->text('Collection has not been deleted'), 'warning');
    }