protected async override void AddNewModelItem(TestGroupDto model)
        {
            IsBusy             = Visibility.Visible;
            model.ModifiedBy   = DIContainer.Resolve <UserRepository>().UserName;
            model.ModifiedDate = DateTime.Now;
            var response = await testService.AddNewTestGroup(model);

            IsBusy = Visibility.Hidden;

            if (response != null && response.Acknowledgement != null)
            {
                if (response.Acknowledgement.Status.Equals(ResponseStatusCode.success.ToString()))
                {
                    GetModelItems();
                }
                else
                {
                    MessageBox.Show("Failed in creating new test group", "Error");
                    SelectedModel = oldSelectedModel;
                }
            }
        }