javafx ComboBox Event and change cell color

public class EffectTest extends Application {
public static void main(String[] args) {
    launch(args);
  }

  @Override
  public void start(Stage stage) {
    stage.setTitle("ComboBoxSample");
    Scene scene = new Scene(new Group(), , );

    ComboBox emailComboBox = new ComboBox();
    emailComboBox.getItems().addAll("A","B","C","D","E");

        emailComboBox.setPromptText("Email address");
    emailComboBox.setEditable(true);
    emailComboBox.valueProperty().addListener(new ChangeListener<String>() {
        @Override public void changed(ObservableValue ov, String t, String t1) {
          System.out.println(ov);
            System.out.println(t);
            System.out.println(t1);
        }
    });

    emailComboBox.setCellFactory(
        new Callback<ListView<String>, ListCell<String>>() {
            @Override public ListCell<String> call(ListView<String> param) {
                final ListCell<String> cell = new ListCell<String>() {
                    {
                        super.setPrefWidth();
                    }
                    @Override public void updateItem(String item,
                        boolean empty) {
                            super.updateItem(item, empty);
                            if (item != null) {
                                setText(item);
                                if (item.contains("A")) {
                                    setTextFill(Color.RED);
                                }
                                else if (item.contains("B")){
                                    setTextFill(Color.GREEN);
                                }
                                else {
                                    setTextFill(Color.BLACK);
                                }
                            }
                            else {
                                setText(null);
                            }
                        }
            };
            return cell;
        }

    });

    GridPane grid = new GridPane();
    grid.setVgap();
    grid.setHgap();
    grid.setPadding(new Insets(, , , ));
    grid.add(new Label("To: "), , );
    grid.add(emailComboBox, , );

    Group root = (Group) scene.getRoot();
    root.getChildren().add(grid);
    stage.setScene(scene);
    stage.show();

  }

}