Back back = new Back(controller);
backButton.disableProperty().bind(back.disabledProperty());
backButton.setOnAction(back);
backButton.setTooltip(new Tooltip("Back: " + back.getAccelerator().getName()));
Forward forward = new Forward(controller);
forwardButton.disableProperty().bind(forward.disabledProperty());
forwardButton.setOnAction(forward);
forwardButton.setTooltip(new Tooltip("Forward: " + forward.getAccelerator().getName()));
}