在cakephp中强行下载后无法显示消息

Question

我想在用户强制下载后显示一条消息。无论从对话框中选择了什么选项，在对话框出现后我都无法显示消息。 我不明白我在此事上发现的上一篇文章，我在文档中找到了关于此事的任何内容。

  public function ...
     $this->downloadexcel($filename);
      //this message never gets displayed
      $this->Session->setFlash(__('Select another file to download . '));
   ...
public function downloadexcel($filename=null) {



     $fullPath='Excelcontacts'.  DS .$filename;

     //the dialog appears and it works fine
      $this->response->file($fullPath, array('download' => true, 'name' => $filename));

      //this message never gets displayed
       $this->Session->setFlash(__('Select another file to download . '));

    // return $this->response;


} 

http://book.cakephp.org/2.0/en/controllers/request-response.html Force download file in CakePHP 2.1