private static ManageStaffController launch() throws IOException { FXMLLoader fxmlLoader = new FXMLLoader(); fxmlLoader.setLocation(ManageStaffController.class.getResource("manageStaff.fxml")); Pane selfPane = fxmlLoader.load(); ManageStaffController controller = fxmlLoader.getController(); controller.informController = InformController.newInformController(selfPane); controller.selfPane = controller.informController.stackPane; return controller; }