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;
  }