public static void SetupNavigationBar(SidebarNavigation.SidebarController sidebarController, NavController navController, UINavigationItem navItem, UIBarButtonItem menuButton)
 {
     menuButton = new UIBarButtonItem(UIImage.FromBundle("hamburger_menu_white.png")
                                      , UIBarButtonItemStyle.Plain
                                      , (sender, args) => {
         sidebarController.ToggleMenu();
     });
     //menuButton.TintColor = Helper.Theme.Color.C2;
     navItem.SetLeftBarButtonItem(menuButton, true);
     navController.NavigationBar.BackgroundColor = Helper.Theme.Color.C2;
     navController.NavigationBar.BarStyle        = UIBarStyle.BlackOpaque;
     navController.NavigationBar.TintColor       = Helper.Theme.Color.C1;
     navController.NavigationBar.BarTintColor    = Helper.Theme.Color.C2;
 }