private void handleAction() { if (xmlLoader.getValue() != null) { AbstractGrid newScreen = ConfigManager.getAbstractGrid( ConfigManager.getString( ConfigManager.scope(this.getClass().getName(), selected.iconName)), xmlLoader.getValue()); nextScreen = newScreen; } else { Alert uhoh = new Alert(AlertType.ERROR); uhoh.setTitle("whoops"); uhoh.setContentText("please select an XML file"); uhoh.showAndWait(); } }