title: Can't create iPad XIB with Xcode 4
body: <p>Alright, I have a problem on my hands.  I'm trying to convert my project to a universal app for the iPhone and the iPad.  I'm trying to make iPad-specific versions of my XIB files.  As it's not possible to <code>Create iPad version using autoresizing masks</code> in Xcode 4, I assumed I'd just be able to pop my XIB into Xcode 3's version of IB, and let that do the magic.  No dice.  Here's the error I get when i try to open the XIB file in IB:</p>
  
  <p><img src="https://i.stack.imgur.com/IPtiy.png" alt="enter image description here"></p>
  
  <p>To be honest I don't know where to proceed from here.  I guess I could just resize my views manually, but that's quite tedious and I don't really have the time to be doing that.  Any ideas?</p>