//TODO: update options of select to
        //case OTHER = "Прочее"
        //case IT_COMPANY = "ИТ-Компания"
        //case PARTICIPANT = "Участник"
        //case MEDIA = "СМИ"

        //TODO: register user in conferecion

        private async void OnSubmit(object sender, RoutedEventArgs e)
        {
            _vm.Model.ValidateAll();
            if (_vm.Model.HasValidationMessages())
            {
                return;
            }

            try
            {
                LoadBar.SetProgressIndicator(true);
                await _vm.CreateUser();
            }
            finally
            {
                LoadBar.SetProgressIndicator(false);
            }
        }
 protected async override void OnNavigatedTo(NavigationEventArgs e)
 {
     base.OnNavigatedTo(e);
     try
     {
         LoadBar.SetProgressIndicator(true);
         if (LoginButton.CurrentUser != null)
         {
             FetchUser(LoginButton.CurrentUser);
         }
         else if (Session.ActiveSession != null && Session.ActiveSession.CurrentAccessTokenData.State != null)
         {
             await RetriveUserInfo();
         }
     }
     finally
     {
         LoadBar.SetProgressIndicator(false);
     }
 }