void Yes_Click(object sender, RoutedEventArgs e)
 {
     Result = NotifyWinButton.Yes;
     Close();
 }
 public ClickButtonEventArgs(NotifyWinButton b)
 {
     button = b;
 }
 void Cancel_Click(object sender, RoutedEventArgs e)
 {
     Result = NotifyWinButton.Cancel;
     Close();
 }