How do disable and/or hide a MenuItem ????

I am using GWT 2.5.1

I have been struggling with this for hours now. How do you disable and/or hide a MenuItem in GWT.

menuItem.setEnabled(false); // DOES NOT WORK !!!
menuItem.setVisible(false); // DOES NOT WORK !!!
UIObject.setVisible(menuItem.getElement(), false); // DOES NOT WORK !!!

Why ?

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