// Use this for initialization
    void Start()
    {
        blackScreen.enabled = true;
        blackScreen.gameObject.SetActive(false);

        gameMenu.SetActive(false);

        HideBossBar();

        //shortcuts should not disappear
        shortcut1.IsNotInv();
        shortcut2.IsNotInv();
        shortcut3.IsNotInv();

        //Register events for item shortcuts
        shortcut1.GetComponent <Button>().onClick.AddListener(() => { GameDataKeeper.GetSingleton().UseItem(shortcut1.m_class); });
        shortcut2.GetComponent <Button>().onClick.AddListener(() => { GameDataKeeper.GetSingleton().UseItem(shortcut2.m_class); });
        shortcut3.GetComponent <Button>().onClick.AddListener(() => { GameDataKeeper.GetSingleton().UseItem(shortcut3.m_class); });
    }