Как открыть второе окно в javafx?

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import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) {
        Button openButton = new Button("Открыть второе окно");
        openButton.setOnAction(event -> openSecondWindow());

        VBox root = new VBox(openButton);
        Scene scene = new Scene(root, 300, 200);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void openSecondWindow() {
        Stage secondStage = new Stage();
        Button closeButton = new Button("Закрыть второе окно");
        closeButton.setOnAction(event -> secondStage.close());

        VBox root = new VBox(closeButton);
        Scene scene = new Scene(root, 300, 200);

        secondStage.setScene(scene);
        secondStage.show();
    }
}