protected override async void OnNew()
        {
            SArgs.StudentId = null;
            EArgs.StudentId = null;
            await StudentDetailsViewModel.LoadAsync(SArgs);

            await StudentEvaluationViewModel.LoadAsync(EArgs);
        }
        public async void OnSelected()
        {
            if (SelectedItem != null)
            {
                SArgs.StudentId = SelectedItem.StudentId;
                EArgs.StudentId = SelectedItem.StudentId;
                await StudentDetailsViewModel.LoadAsync(SArgs);

                await StudentEvaluationViewModel.LoadAsync(EArgs);
            }
        }