private void ExpressionsDialog_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            ExpressionsDialog dlg = new ExpressionsDialog(ref _DataSet);

            dlg.Owner = this;
            dlg.ShowDialog();
        }
 private void ExpressionsDialog_Executed(object sender, ExecutedRoutedEventArgs e)
 {
     ExpressionsDialog dlg = new ExpressionsDialog(ref _DataSet);
     dlg.Owner = this;
     dlg.ShowDialog();
 }