Look at the attached movie.

Code:
    @Override
    public void start(Stage stage) throws Exception {
        Accordion acc = new Accordion();

        TitledPane pane1 = new TitledPane();
        pane1.setText("Text");
        pane1.setGraphic(new Label("Node"));
        pane1.setContent(new Button("Button"));
        acc.getPanes().addAll(pane1);

        VBox pane = new VBox();
        pane.getChildren().addAll(acc);
        Scene scene = new Scene(pane, 300, 700);
        stage.setScene(scene);
        stage.show();
    }

Text text become white, when TitledPane is selected. Node label("Node") is still black.