title: Switch view controller without creating new instance
body: <p>Using three view controllers in my application. I just created navigation using storyboard segues. While using segues navigation to other views creating new instance for view controller. Consider navigation from A->B-C. How to navigate into A or B from C which is already retain in memory?
  Note: Here i am not able to use dismissviewcontroller which will remove the instance of C. Such that my navigation should be to already created instance.</p>