如何在StackPane中重新定位VBox

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        StackPane stackPane = new StackPane();

        VBox vBox = new VBox();
        vBox.setSpacing(10);
        vBox.setPadding(new Insets(10));

        Button button1 = new Button("Button 1");
        Button button2 = new Button("Button 2");

        vBox.getChildren().addAll(button1, button2);

        stackPane.getChildren().add(vBox);

        // 设置VBox在StackPane中的位置
        StackPane.setMargin(vBox, new Insets(50, 100, 50, 100));

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

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