function customizeSubtitle()
 {
     $msg = wfMsgExt('lqt_hist_view_whole_thread', 'parseinline');
     $threadhist = $this->permalink($this->thread->topmostThread(), $msg, 'thread_history');
     $this->output->setSubtitle(parent::getSubtitle() . '<br />' . $this->output->getSubtitle() . "<br />{$threadhist}");
     return true;
 }