title: UINavigationController add Right button
body: <p>I know this question was asked many times, but I didn't find my situation:
  I have 1 UINavigationController in Main window. Main Window сontains also UITableView. When i select row, NavigationController pushes another UIViewController with nib. This UIViewController doesn't have Navigation controller, it contains only UITableView inside.</p>
  
  <p>Here is screenshot of this UIViewController:</p>
  
  <p><img src="https://i.stack.imgur.com/NgsXL.png" alt="enter image description here"></p>
  
  <p>This is not Main Window. Main Window contains UINavigationController with UITableView.</p>
  
  <p>And here is question:</p>
  
  <p>How to add UIBarButtonItem into NavigationItem when i'm in pushed UIViewController? </p>