title: steps to add tabbarcontroller to AppDelegate using Interface Builder in XCode 4.2 Empty Application template
body: <p>while I'm stuck <a href="https://stackoverflow.com/questions/8200059/tab-bar-is-shifted-down-outside-the-borders-of-the-simulator">at this question</a> I cannot find the right steps to add a UITabBarController to the AppDelegate (not programatically) but by using interface builder for the "Empty Application" template, I tried to add a new empty xib file, then dropped uitabbarcontroller into it, but there is no way to link it (from IB) to AppDelegate !! i.e. when I move the blue line from tabbarcontroller object (in document outline) to File's Owner, interface builder shows only the "Delegate" option in the shown list so there is no IBOutlet option in there.</p>
  
  <p>so, what are the exact steps for adding a tabbarcontroller and connect it to appDelegate using the interface builder way (for the Empty Application template, using XCode 4.2 and IOS 5 SDK) ?</p>
  
  <p>step1: create new Empty Application template project.</p>
  
  <p>... waiting for the next steps...</p>
  
  <p>thanks so much in advance.</p>