How to get the IDs of nodes inside HTMLEditor, JavaFX

I wish to remove some of the control buttons from HTMLEditor, since I do not need them. for that I need to reach the desired node. How can I know the IDs of nodes inside HTMLEditor? Please see the following. Thank you!

public class myApp extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("myApp.fxml")); //this fxml has HTMLEditor named htmlEditor.
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();

        Node someControlInsideHtmlEditor = root.lookup("#htmlEditor").lookup("#what_Is_The_ID_of_This_someControlInsideHtmlEditor")
    }
}