title: Drag custom view onto window in Interface Builder?
body: <p>I'm coming from the world of C# and Winforms where I can build a custom UserControl and drag it onto a form as if it were a common control. Is there a way to do that in Xcode and Interface Builder?</p>
  
  <p>I've only seen how to set the view at runtime but I'd like to see it on my window at design time. For example, I'd expect my custom view to be listed in the available controls.</p>
  
  <p>Thanks!</p>
  
  <p>Simon</p>