* and return an Object as result can be used as source.
*/
Injector.setConfigurationSource(customProperties::get);
System.setProperty("happyEnding", " Enjoy the flight!");
DashboardView appView = new DashboardView();
Scene scene = new Scene(appView.getView());
stage.setTitle("followme.fx");
final String uri = getClass().getResource("app.css").toExternalForm();
scene.getStylesheets().add(uri);
stage.setScene(scene);
stage.show();