Run code, press alt+M, select test menu, press enter, press tab to focus textfield not working

code:

package teste;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class MenuBarTest extends Application {

@Override
public void start(final Stage stage) throws Exception {
BorderPane root = new BorderPane();

MenuBar menuBar = new MenuBar();

Menu menu = new Menu("_Menu1");
menu.getItems().add(new MenuItem("Teste"));

menuBar.getMenus().add(menu);

root.setTop(menuBar);

                //after show menu (by mnemonic) tab and arrows keys lock
FlowPane p1 = new FlowPane();
p1.getChildren().addAll(new TextField("1-campo1"),new TextField("1-campo2"),new TextField("1-campo3"));

root.setBottom(p1);

Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle("TEST");
stage.setWidth(500);
stage.setHeight(500);
stage.show();
}

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

}
}