private int _currentSlideIndex     = 0;                                 // Slide index

        private void Awake()
        {
            // Get UINavigation component
            _uiNavigation = GetComponent <UINavigation>();
            // Add on click listeners to UIButtons
            //_uiButtonNavigation.Buttons[0].onClick.AddListener(() => OnButtonTestLevelClicked(_uiButtonNavigation.Buttons[0]));
            //_uiButtonNavigation.Buttons[1].onClick.AddListener(() => OnButtonQuitClicked(_uiButtonNavigation.Buttons[1]));
        }
        private UINavigation _uiNavigation = null;                              // Reference to the UINavigation component

        private void Awake()
        {
            // Get UINavigation component
            _uiNavigation = GetComponent <UINavigation>();
            // Add on click listeners to buttons
            //_uiButtonNavigation.Buttons[0].onClick.AddListener(() => OnButtonResumeClicked(_uiButtonNavigation.Buttons[0]));
            //_uiButtonNavigation.Buttons[1].onClick.AddListener(() => OnButtonMenuClicked(_uiButtonNavigation.Buttons[1]));
            //_uiButtonNavigation.Buttons[2].onClick.AddListener(() => OnButtonQuitClicked(_uiButtonNavigation.Buttons[2]));
        }