code: @Override
      protected Scene loadScene() throws CouldNotPerformException {
          try {
              // setup scene
              Scene scene;
              try {
                  scene = new Scene(FXMLProcessor.loadFxmlPane(FXMLProcessor.loadDefaultFXML(controllerClass), getClass()));
              } catch (final Exception ex) {
                  throw new CouldNotPerformException("Could not load fxml description!", ex);
              }
              try {
                  scene.getStylesheets().add(getDefaultCSS());
              } catch (final Exception ex) {
                  throw new CouldNotPerformException("Could not load css description!", ex);
              }
              return scene;
          } catch (final CouldNotPerformException ex) {
              throw new CouldNotPerformException("Could not load scene!", ex);
          }
      }
docs: {@inheritDoc}
  
  @return {@inheritDoc}
  
  @throws CouldNotPerformException {@inheritDoc}