private void AddDiscipline()
        {
            DisciplineEditViewModel viewModel = new DisciplineEditViewModel(null);

            new DisciplineEditorWindow(viewModel).ShowDialog();
            RefreshDisciplines();
        }
        private void EditDiscipline(Discipline discipline)
        {
            if (discipline == null)
            {
                _dialogCoordinator.ShowMessageAsync(this, "Внимание", "Выберите дисциплину");
                return;
            }
            DisciplineEditViewModel viewModel = new DisciplineEditViewModel(discipline);

            new DisciplineEditorWindow(viewModel).ShowDialog();
            RefreshDisciplines();
        }