See the code below: the ActionEvent on the Menu labeled "SubMenu" is not fired.
It seems, it is only fired by MenuItems, but not by Menus.

I have a legitimate use case for this and I hope this isn't by design (because the default action is to show the sub menu).
I also don't have the ability to use addEventFilter, in case the event is consumed, by the default implementation.


import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;


public class TestApp3 extends Application {
    public static void main(String[] args) throws Exception {
        launch(args);
    }

    public void start(final Stage stage) throws Exception {

        VBox root = new VBox();

        MenuBar menuBar = new MenuBar();

        Menu mainMenu = new Menu("MainMenu");

        menuBar.getMenus().add(mainMenu);

        Menu subMenu = new Menu("SubMenu");
        subMenu.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                System.out.println("SubMenu action does not work");
            }
        });

        mainMenu.getItems().add(subMenu);

        MenuItem subMenuItem = new MenuItem("SubMenuItem");

        subMenu.getItems().add(subMenuItem);

        subMenuItem.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                System.out.println("SubMenuItem action");
            }
        });

        root.getChildren().add(menuBar);

        Scene scene = new Scene(root, 500, 500);
        stage.setScene(scene);
        stage.show();
    }
}