title: Strange error when adding items to prototype cells in storyboard-IB
body: <p>I have quite a large project (~20 scenes). One of which is a TableViewController with a custom UITableViewController class. I have given the cell a reuse identifier, and added a label to it. When I try and Ctrl+Drag the label to the UITableViewController header file to create an outlet, I get the following error:</p>
  
  <blockquote>
    <p>error: Illegal Configuration: Connection "tableInfoView" cannot have a
    prototype object as its destination.</p>
  </blockquote>
  
  <p>What is this? Am I overlooking something obvious? Or do I need to create a custom cell class and drag the outlet to that? If so, how do I then specify the data which is displayed uniquely for each cell from the UITableViewController?</p>