private void OnClosing(object sender, CloseEventArgs e)
        {
            IEditRunningTimeViewModel viewModel = (IEditRunningTimeViewModel)DataContext;

            viewModel.Closing -= OnClosing;

            DialogResult = e.Result == Result.OK;

            Close();
        }
        private void OnLoaded(object sender, RoutedEventArgs e)
        {
            IEditRunningTimeViewModel viewModel = (IEditRunningTimeViewModel)DataContext;

            viewModel.Closing += OnClosing;
        }