private void Button_Click_1(object sender, RoutedEventArgs e)
 {
     AboutDialog dlg = new AboutDialog();
     dlg.Owner = App.Current.MainWindow;
     dlg.ShowDialog();
 }
 private void Button_Click(object sender, RoutedEventArgs e)
 {
     AboutDialog dlg = new AboutDialog();
     dlg.Show();
 }