如何在JavaFX中从匿名MenuItem抓取文本？

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.Menu;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class MenuItemTextCapture extends Application {

    @Override
    public void start(Stage primaryStage) {
        MenuItem anonymousMenuItem = new MenuItem();
        anonymousMenuItem.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                MenuItem menuItem = (MenuItem) event.getSource();
                Menu parentMenu = menuItem.getParentMenu();
                String menuText = parentMenu.getText();
                showAlert("Captured Text", "Menu Text: " + menuText);
            }
        });

        ContextMenu contextMenu = new ContextMenu();
        contextMenu.getItems().add(anonymousMenuItem);

        StackPane root = new StackPane();
        root.setContextMenu(contextMenu);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("MenuItem Text Capture");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void showAlert(String title, String message) {
        Alert alert = new Alert(AlertType.INFORMATION);
        alert.setTitle(title);
        alert.setHeaderText(null);
        alert.setContentText(message);
        alert.showAndWait();
    }

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