WPF DataGrid как перейти к определенному элементу по ID

            int a = Convert.ToInt32((sender as ListBox).SelectedItem.ToString().Split()[0]) -1 ; 
            attachment_ADataGrid.SelectedIndex = a;
            CollectionViewSourceAttachmentA.View.MoveCurrentToPosition(a);

        CollectionViewSource CollectionViewSourceAttachmentA;
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            TTR43.attachment_ADataSet attachment_ADataSet = ((TTR43.attachment_ADataSet)(this.FindResource("attachment_ADataSet")));
 
            // Загрузить данные в таблицу attachment_A. Можно изменить этот код как требуется.
            TTR43.attachment_ADataSetTableAdapters.attachment_ATableAdapter attachment_ADataSetattachment_ATableAdapter = new TTR43.attachment_ADataSetTableAdapters.attachment_ATableAdapter();
            attachment_ADataSetattachment_ATableAdapter.Fill(attachment_ADataSet.attachment_A);
            System.Windows.Data.CollectionViewSource attachment_AViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("attachment_AViewSource")));
            //attachment_AViewSource.View.MoveCurrentToFirst();
            CollectionViewSourceAttachmentA = attachment_AViewSource;