I know this has got the be amazingly easy, but what am I missing here?

so I created a 2 view tabbed app from the template. Im trying to add a third tab.
I added a 'secondviewcontroller.h/m' for the third window, created a new xib file. in IB set the owner of the third tab to 'secondviewcontroller'.
but in IB when I click on the second tab it says loaded from NIB, but on the third it does not say that.
What linkage am I missing here? It doesnt appear as if the tabs themselves are linked to anything.
cheers.rob
********** well it looks like using the windows based app then adding a tab bar was the easiest route and not confuzzling at all. a very simple example is here:
http://www.iphonesdkarticles.com/200...-tutorial.html
cheers.bo