Separator
Separator separator1 = new Separator();
Separator separator2 = new Separator();
Button button1 = new Button("Button1");
Button button2 = new Button("Button2");
Button button3 = new Button("Button3");
Button button4 = new Button("Button4");
HBox hBox = new HBox(button3, separator2, button4);
separator2.setOrientation(Orientation.VERTICAL);
separator2.setPrefWidth(20);
separator2.setValignment(VPos.CENTER);
separator2.setHalignment(HPos.CENTER);