void OnButtonClick()
    {
        ObjectSpawnerTool objectSpawnerTool = toolGun.GetComponent <ObjectSpawnerTool> ();

        if (!objectSpawnerTool)
        {
            toolGun.AddComponent(typeof(ObjectSpawnerTool));
        }
        objectSpawnerTool.objectPrefab = objectPrefab;
        if (fireToolGunOnTileClick)
        {
            objectSpawnerTool.FireToolGun();
        }
    }
 void Start()
 {
     gameObject.tag    = "toolGun";
     objectSpawnerTool = gameObject.GetComponent <ObjectSpawnerTool> ();
 }