void LoginManager::login(QString login, QString password)
      {
      if(login == "" || password == "")
           return;
      
      connect(_oauthManager, SIGNAL(requestReady(QByteArray)),
                this, SLOT(onAccessTokenRequestReady(QByteArray)), Qt::UniqueConnection);

      KQOAuthRequest_XAuth *oauthRequest = new KQOAuthRequest_XAuth(this);
      oauthRequest->initRequest(KQOAuthRequest::AccessToken, QUrl("https://api.musescore.com/oauth/access_token"));
      oauthRequest->setConsumerKey(_consumerKey);
      oauthRequest->setConsumerSecretKey(_consumerSecret);
      oauthRequest->setXAuthLogin(login, password);
      _oauthManager->executeRequest(oauthRequest);
     }