An attempt at a JavaFX menubar and keystroke listener

This code for creating a JavaFX menubar and handling a keystroke/key-combination didn’t work as desired, but I think it’s on the right track:

val menuBar = new MenuBar
val editMenu = new Menu("Edit")
val findMenuItem = new MenuItem("Find")
findMenuItem.setAccelerator(new KeyCodeCombination(KeyCode.F, KeyCombination.META_DOWN))
findMenuItem.setOnAction((e: ActionEvent) => {
    println("GOT A COMMAND-F")
})
editMenu.getItems.addAll(findMenuItem)
menuBar.prefWidthProperty().bind(mainStage.widthProperty())
mainGridPane.getChildren.add(menuBar)
root.setTop(menuBar)

In this code the root element is a BorderPane instance. I’m abandoning this approach because I really don’t want a JavaFX menubar in my application, but I think if I managed the BorderPane properly it would have worked. (Note that the code shown is written in Scala, but it easily translates to Java.)