private void MenuItem_Click_9(object sender, RoutedEventArgs e)
 {
     menuExt.Visibility = Visibility.Collapsed;
     ConFrame.Navigate(new Pages.Login());
 }
 private void MainWindow_Loaded(object sender, RoutedEventArgs e)
 {
     menuExt.Visibility = Visibility.Collapsed;
     ConFrame.Navigate(new Pages.Login());
 }