public EditorScreen(TopazGame game) {
        super(game, true);

        createUI();
...

private void createUI() {
        stage = new Stage();
        skin = new Skin(Gdx.files.internal("data/ui/uiskin.json"));

        Gdx.input.setInputProcessor(stage);

        TextButton btnWall = new TextButton("Make Wall", skin);
        btnWall.setPosition(0, Gdx.graphics.getHeight() - btnWall.getHeight());
        stage.addActor(btnWall);

        btnWall.addListener(new ChangeListener() {
            @Override
            public void changed(ChangeListener.ChangeEvent event, Actor actor) {
                selectionType = 0;
            }
        });
    }

...

public void render(float delta) {
        update();
        clearScreen();

        batch.begin();

        drawObjects();

        batch.end();

        uiBatch.begin();

        stage.act();
        stage.draw();

        uiBatch.end();

        renderLights();
        renderDebugPhys();
    }