Pagination control is not visible in scene after resize

@Override
    public void start(Stage stage) throws Exception {
        HBox root = new HBox(30);
        Pagination p = new Pagination(20, 5);
        p.getStyleClass().add(Pagination.STYLE_CLASS_BULLET);
        root.getChildren().add(p);
        Pagination p2 = new Pagination(20, 5);
        root.getChildren().add(p2);
        Scene scene = new Scene(root, 300, 300);
        stage.setScene(scene);
        stage.setTitle(VersionInfo.getRuntimeVersion());
        stage.show();
    }