void btnReg_Click(object sender, RoutedEventArgs e)
 {
     wnd = new RegistryWnd();
     wnd.Closing += wnd_Closing;
     wnd.ShowDialog();
 }
 void btnReg_Click(object sender, RoutedEventArgs e)
 {
     wnd          = new RegistryWnd();
     wnd.Closing += wnd_Closing;
     wnd.ShowDialog();
 }