How to make ModalPane work?

[PavelTurk]

I am trying to show a modal box in a modal pane. This is my code:

public class AtlantaFxTest extends Application {

    @Override
    public void start(Stage stage) {
        Application.setUserAgentStylesheet(new PrimerDark().getUserAgentStylesheet());
        var modalPane = new ModalPane();
        var box = new ModalBox(new TextArea("Fffffffffffffffffffffffffff"));
        modalPane.show(box);
        var root = new StackPane(modalPane);
        Scene scene = new Scene(root, 600, 400);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Could anyone say how to do it?

[DeYuanGeGe]

modalPane须在stage.show()之后调用modalPane.show(node)，修改如下：

public void start(Stage stage) {
        Application.setUserAgentStylesheet(new PrimerDark().getUserAgentStylesheet());
        var modalPane = new ModalPane();
        var root = new StackPane(modalPane);
        var box = new ModalBox(new TextArea("Fffffffffffffffffffffffffff"));
        Scene scene = new Scene(root, 600, 400);
        stage.setScene(scene);
        stage.show();
        modalPane.show(box);
}