public function MailSaveDraftMails(CbgrnMailDraftMailType $save_draft)
 {
     // $save_draft : CbgrnMailDraftMailType class (only one)
     $this->CheckAndSetHeader(__FUNCTION__);
     $reg_args["save_mail"] = $save_draft->getObjectVars();
     $this->encodeString($reg_args);
     $results = parent::MailSaveDraftMails($reg_args);
     $this->methodClose();
     return $this->decodeString($results->mail);
 }