private void createNetworkBtn_Click(object sender, RoutedEventArgs e)
 {
     if (!FormValidation.isConfigurationValid(configurationBox, out string configurationError))
     {
         networkStatus.Content = configurationError;
         return;
     }
     configuration = new Configuration(configurationBox.Text);
     network       = new Network(configuration);
     reset();
     networkStatus.Content = "Sieć utworzona";
 }