如何在FXControls中垂直对齐StatusBar的子元素？

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.StatusBar;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class VerticalAlignmentExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        StatusBar statusBar = new StatusBar();
        VBox vbox = new VBox();
        vbox.setAlignment(Pos.CENTER); // 设置VBox垂直居中对齐
        statusBar.setText("Status: Ready");

        Button button = new Button("Submit");
        button.setAlignment(Pos.CENTER); // 设置Button垂直居中对齐

        Label label = new Label("Message");
        label.setAlignment(Pos.CENTER); // 设置Label垂直居中对齐

        vbox.getChildren().addAll(button, label);
        statusBar.getCenterItems().add(vbox);

        Scene scene = new Scene(statusBar, 400, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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