Problema metodo getChildren().addAll(...)

[valemancu]

Buongiorno a tutti! Ho un problema con il metodo root.getChildren().addAll(...).

import java.awt.TextField;

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

public class Prova2 extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Label name = new Label("name:");
        TextField tf = new TextField();
        Button ok = new Button("OK");
        Button cancel = new Button ("Cancel");
        HBox root = new HBox(10);
        root.getChildren().addAll(name,tf,ok,cancel);
        root.setStyle("-fx-padding: 10;" 
                + "-fx-border-style: solid inside;"
                + "-fx-border-width: 2;"
                + "-fx-border-insets: 5;"
                + "-fx-border-radius: 5;"
                + "-fx-border-color: blue");
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.setTitle("Using HBox");
        stage.show();
    }
    
    public static void main(String[] args){
        launch(args);
    }
}

Mi da il seguente errore:
The method addAll(int, Collection<? extends Node>) in the type List<Node> is not applicable for the arguments (Label, TextField, Button, Button)

Non riesco a capire, la classe Node contiene sia Label, sia Button, siaTextField. Mi sono dimenticata qualche libreria in particolare?