GameObject.active is obsolete

I'm trying to add GameObject.SetActiveRecursively and .active to my PickUp script, but I can't use them at all. In place of those two are .SetActive() which is fine, but I need .active or something that serves the same function as it. .activeSelf, and .activeInHierarchy won't work either. It just says read only. Any help? I'm using Unity 4 if that helps