问如何允许元素(例如，HBox)的大小在它所属的阶段之外增长(溢出

EN

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class GrowingHBoxTest extends Application {

    int count = 0 ;

    @Override
    public void start(Stage primaryStage) {
        HBox hbox = new HBox();
        Button button = new Button("New label");
        button.setOnAction(e -> hbox.getChildren().add(new Label("Label "+(++count))));

        hbox.setMaxWidth(Double.MAX_VALUE);

        BorderPane root = new BorderPane();
        root.setBottom(button);

        // will not grow outside of scene bounds:
        root.setCenter(hbox);

        // will grow outside of scene bounds:
//      root.setCenter(new Group(hbox));

        primaryStage.setScene(new Scene(root, 400, 400));
        primaryStage.show();
    }

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