private void BuyItem(PodPart podPart)
 {
     if (MoneyManager.instance.WithdrawMoney(podPart.price))
     {
         Debug.Log("bought an item : " + podPart.name);
         PodManager.instance.collection[PodManager.instance.selectedPod].InstallPodPart(podPart);
         Refresh();
     }
     else
     {
         Debug.Log("couldn't buy " + podPart.name);
     }
 }
    public void InstallPodPart(PodPart part)
    {
        EnginePodPart engine = part as EnginePodPart;

        if (engine != null)
        {
            InstallEngine(engine);
        }

        InjectorPodPart injector = part as InjectorPodPart;

        if (injector != null)
        {
            InstallInjector(injector);
        }
    }