How to make move between storyboard viewcontrollers from subview controller?

[mrgithub]

Can't get a subview controller to elegantly perform a segue on the main containing controller (see below)?

        NavigationRoot = new RootElement ("Navigation") {
            new Section ("Menu") {
                new StringElement ("Mapview Controller"),
                new StringElement ("Another View Controller"),
            }
        },

        ViewControllers = new [] {

      // mapview is a view inside this viewcontroller and able to perform segues
            new UIViewController { View = mapView },

      // this is a seperate viewcontroller but is embedded inside the flyoutNavigation
     // AnotherViewController cant seem to call the root navigation controller (<-- actually a uiNav inside a tab bar nav) so i can perform a segue movement just like the above mapViewController??
            this.Storyboard.InstantiateViewController("AnotherViewController") as AnotherViewController,

        },

    // sub viewcontroller i.e. AnotherViewController trying to move mainViewController to perform a segue..
    // throws error: Receiver (<FlyoutNavigation.FlyoutNavigationController: 0x14360600>) has no segue with identifier 'segueTest'

   this.ParentViewController.PerformSegue("segueTest", this);