private function buildCommentForm(PhamePost $post)
 {
     $viewer = $this->getViewer();
     $draft = PhabricatorDraft::newFromUserAndKey($viewer, $post->getPHID());
     $box = id(new PhabricatorApplicationTransactionCommentView())->setUser($viewer)->setObjectPHID($post->getPHID())->setDraft($draft)->setHeaderText(pht('Add Comment'))->setAction($this->getApplicationURI('post/comment/' . $post->getID() . '/'))->setSubmitButtonName(pht('Add Comment'));
     return phutil_tag_div('phui-document-view-pro-box', $box);
 }