private HBox getButtons(Buttons buttons) {
            HBox box = getButtonsHBox();
                    
            switch (buttons) {
                case OK:
                    box.getChildren().add(getOkButton());
                    break;
                case OK_CANCEL:
                    box.getChildren().add(getOkButton());
                    box.getChildren().add(getCancelButton());
                    break;
                case YES_NO:
                    box.getChildren().add(getYesButton());
                    box.getChildren().add(getNoButton());
                    break;
                case YES_NO_CANCEL:
                    box.getChildren().add(getYesButton());
                    box.getChildren().add(getNoButton());
                    box.getChildren().add(getCancelButton());
            }
            
            return box;
        }