public function MessageModifyThreads(CbgrnThreadType $thread)
 {
     // $thread : CbgrnThreadType class (only ONE)
     //      remark: thread has files, so MessageCreateThreadsRequestType's file no needs?
     $this->CheckAndSetHeader(__FUNCTION__);
     $reg_args["modify_thread"]["thread"] = $thread;
     $this->encodeString($reg_args);
     $results = parent::MessageModifyThreads($reg_args);
     $this->methodClose();
     return $this->decodeString($results);
 }