title: After coming back to Root_View Navbar buttons for slide menu doesn't work anymore
body: <p>I use swift3 and MMDrawerController for creating slide menu.</p>
  
  <p>the MMDrawerController codes are these, which are on appdelegate :</p>
  
  <pre><code>    let mainStoryBoard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
  
      let homeViewController = mainStoryBoard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController
      let cartViewController = mainStoryBoard.instantiateViewController(withIdentifier: "CartViewController") as! CartViewController
      let menuViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MenuVCGuest") as! MenuVCGuest
  
      let leftSideNav = UINavigationController(rootViewController: cartViewController)
      let centerNav = UINavigationController(rootViewController: homeViewController)
      let rightSideNav = UINavigationController(rootViewController: menuViewController)
  
      centerContainer = MMDrawerController(center: centerNav, leftDrawerViewController: leftSideNav, rightDrawerViewController: rightSideNav)
  </code></pre>
  
  <p>Everything works fine and I can navigate to some other ViewControllers from slide menu... but if I navigate to a ViewController from another UINavigationController and come back to Main page of App (Root_View), The slide menu buttons from navigationbar does not work anymore...</p>
  
  <p>I created multiple UINavigationController to open new pages in full Screen view not as sub view of a navigation process...</p>
  
  <p><a href="https://i.stack.imgur.com/wqRzX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wqRzX.jpg" alt="enter image description here"></a></p>
  
  <p>So with separating the UINavigationControllers, the slide menu buttons on main page navigation bar stops working!</p>
  
  <p>what should I do now?</p>
  
  <p>Sorry for my poor english...</p>