App.xaml.fs

namespace CheapIroning

open Xamarin.Forms

type App() as thisG =
    // this works:
    // inherit Application(NavigationPage(UnauthPage(fun () -> this.changeToLoggedIn |> ignore)))
    // but afterwards, calling the passed function crashes the app

    inherit Application()

    do
        // this block of code is executed
        // however, on startup, no page is displayed
        // passing thisG.page1 doesn't change the outcome
        thisG.MainPage = thisG.page2
        ()

    member this.changeToLoggedIn = 
        this.MainPage = upcast NavigationPage(CheapIroningPage())

    member this.page1 =
        NavigationPage(CheapIroningPage()) :> Page

    member this.page2 =
        NavigationPage(UnauthPage(fun () -> this.changeToLoggedIn |> ignore)) :> Page