ContextMenu: accelerators not working without access to hidden api

Happens if the contextMenu is shown directly in onContextMenuRequested (vs control.setContextMenu - which isn't available for Nodes that are not of type Control anyway).

To reproduce, compile and run the example below
- press F9
- expected: log message printed
- actual: nothing

To make it work, uncomment the access to hidden api. Actually, even this need for additional registration is unexpected - would expect accelerators to "just work" when set on a MenuItem.

In RL it's critical f.i. in contextMenus of TableHeader: see http://stackoverflow.com/q/39721544/203657

import java.util.logging.Logger;

import com.sun.javafx.scene.control.ControlAcceleratorSupport;

//import de.swingempire.fx.util.FXUtils;
import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.input.KeyCombination;
import javafx.scene.layout.BorderPane;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Shape;
import javafx.stage.Stage;

/**
 * @author Jeanette Winzenburg, Berlin
 */
public class BugAcceleratorNotNode extends Application {

    private Parent getContent() {
        
        ContextMenu circleMenu = new ContextMenu();
        MenuItem circleItem = new MenuItem("in Circle");
        circleMenu.getItems().add(circleItem);
        circleItem.setAccelerator(KeyCombination.valueOf("F9"));
        circleItem.setOnAction(e -> LOG.info("action in Circle"));
        Shape circle = new Circle(200);
        circle.setOnContextMenuRequested(e -> {
            LOG.info("requested: " + e);
            circleMenu.show(circle, e.getScreenX(), e.getScreenY());
        });
        // uncomment to make accelerator work
        //ControlAcceleratorSupport.addAcceleratorsIntoScene(circleMenu.getItems(), circle);

        BorderPane pane = new BorderPane(circle);
        return pane;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setScene(new Scene(getContent(), 600, 400));
  // primaryStage.setTitle(FXUtils.version());
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    @SuppressWarnings("unused")
    private static final Logger LOG = Logger
            .getLogger(BugAcceleratorNotNode.class.getName());
}