javafx MenuButton : click on subelement

Hi,

I've a MenuButton on my application, under this MenuButton 2 elements to click. Actually, i can't found Elements to click on

By script :

I can MenuButton.DropDown => the list appears

I can find labels MenuButton.getItems().get(2).getText() => it s OK the correct label is returned

By KeywordTest :

A clic on a subelement on my MenuButton gives me another element

....java.contextmenu.scene31.pane.popupcontrolecssbridge.contextmenucontextmenubox.myelement

I can click on it, but a really want to control my elements, and i dont know if on a future release, the aliase will be correct

How can i found and CLick on sub element of this MenuButton by script ?

Thx a lot

Fabrice