Possible Duplicate:
Xcode 4.2 Warnings when dropping Nav Controller on Tab Bar in IB
I've been trying to open up a sample that is kind of close to the app that I'm trying to build, but when I go to mainWindow.xib and customize the tab bar that was already there, It just doesn't update when I build and run the app. The tab bar just does not change as if I was not saving the xib file. It gives me...
"Defines Presentation context is not available prior to xcode 4.2"
That happened after I changed the target so I could get along with the new app.
Does that mean I just can't grab a sample and move on from there ?
How do I make it work ?