从e4 EventHandler对JavaFX对话框进行的线程访问无效

import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Dialog;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class DialogExample extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        Button showDialogButton = new Button("Show Dialog");
        showDialogButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                // 创建对话框
                Dialog<String> dialog = new Dialog<>();
                dialog.setTitle("Dialog Example");
                dialog.setContentText("This is a dialog.");

                // 创建按钮
                Button closeButton = new Button("Close");
                closeButton.setOnAction(new EventHandler<ActionEvent>() {
                    @Override
                    public void handle(ActionEvent event) {
                        // 关闭对话框
                        dialog.close();
                    }
                });

                // 将按钮添加到对话框
                VBox vbox = new VBox();
                vbox.getChildren().add(closeButton);
                dialog.getDialogPane().setContent(vbox);

                // 显示对话框
                Platform.runLater(new Runnable() {
                    @Override
                    public void run() {
                        dialog.show();
                    }
                });
            }
        });

        VBox vbox = new VBox();
        vbox.getChildren().add(showDialogButton);

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