A DESCRIPTION OF THE PROBLEM :
Current Sample:
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ToggleGroup toggleGroup = new ToggleGroup();

RadioMenuItem radioItem1 = new RadioMenuItem("Option 1");
radioItem.setOnAction(new EventHandler<ActionEvent>() {
    @Override public void handle(ActionEvent e) {
        System.out.println("radio toggled");
    }
});
radioItem1.setToggleGroup(toggleGroup);
RadioMenuItem radioItem2 = new RadioMenuItem("Option 2");
radioItem.setOnAction(new EventHandler<ActionEvent>() {
    @Override public void handle(ActionEvent e) {
        System.out.println("radio toggled");
    }
});
radioItem2.setToggleGroup(toggleGroup);

Supposed to be using radioItem1 and radioItem2
-----------------

ToggleGroup toggleGroup = new ToggleGroup();

RadioMenuItem radioItem1 = new RadioMenuItem("Option 1");
radioItem1.setOnAction(new EventHandler<ActionEvent>() {
    @Override public void handle(ActionEvent e) {
        System.out.println("radio toggled");
    }
});
radioItem1.setToggleGroup(toggleGroup);
RadioMenuItem radioItem2 = new RadioMenuItem("Option 2");
radioItem2.setOnAction(new EventHandler<ActionEvent>() {
    @Override public void handle(ActionEvent e) {
        System.out.println("radio toggled");
    }
});
radioItem2.setToggleGroup(toggleGroup);