JavaFX不能在BorderPane上打印网格

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class GridPrintExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        BorderPane root = new BorderPane();

        // 创建一个GridPane对象
        GridPane gridPane = new GridPane();

        // 在GridPane中添加网格数据，这里以添加文本标签为例
        for (int row = 0; row < 10; row++) {
            for (int col = 0; col < 10; col++) {
                gridPane.add(new Label("Grid " + row + "-" + col), col, row);
            }
        }

        // 将GridPane添加到BorderPane的中间位置
        root.setCenter(gridPane);

        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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