TextField username = new TextField();
    username.setPromptText("Username");
    PasswordField password = new PasswordField();
    password.setPromptText("Passwort");
    TextField server = new TextField();
    server.setPromptText("Server");
    TextField gamerid = new TextField();
    gamerid.setPromptText("Gamer-ID");
    TextField port = new TextField();
    port.setPromptText("Port");





    grid.add(new Label("Username:"), 0, 0);
    grid.add(username, 1, 0);
    grid.add(new Label("Passwort:"), 0, 1);
    grid.add(password, 1, 1);
    grid.add(new Label("Server:"), 0, 2);
    grid.add(server, 1, 2);
    grid.add(new Label("Gamer-ID:"), 0, 3);
    grid.add(gamerid, 1, 3);
    grid.add(new Label("Port:"), 0, 4);
    grid.add(port, 1, 4);
    dialog.getDialogPane().setContent(grid);

    Optional<ButtonType> result = dialog.showAndWait();
    // System.out.println(result);
    if (result.get().getButtonData() == ButtonData.OK_DONE) {
      System.out.println("Username: " + username.getText());
      System.out.println("Passwort: " + password.getText());
      System.out.println("Server:   " + server.getText());
      System.out.println("Gamer-iD: " + gamerid.getText());
      System.out.println("Port:     " + port.getText());
    } else {
      System.out.println("Abbruch");