code: public static InputDialog showInputDialog (Stage stage, String title, String fieldTitle, InputDialogListener listener) {
  		InputDialog dialog = new InputDialog(title, fieldTitle, true, null, listener);
  		stage.addActor(dialog.fadeIn());
  		return dialog;
  	}
docs: Dialog with text and text field for user input. Cannot be canceled.
  @param title dialog title.
  @param fieldTitle displayed before input field, may be null.
  @param listener dialog buttons listener.