This post will describe you “How to enable Zombi objects in XCode 4.0.2?”.
1) Select your project.
2) Click on your Project Name from the tool bar as shown above & A popup menu will appear as follows.
3) Click on the “Edit Scheme” from that popup menu. By clicking that option, A subWindow will appear as follows.
4) Click on Diagnostics tab from that “Debug configurations”.
5) Just check On or off to enable Zombie objects.