Using Xamarin Forms, how do I override the back button functionality?

Question

Using Xamarin Forms, I have a MasterDetailPage whose Master is a list of menu options and Detail is a NavigationPage that contains a ContentPage. If I push a second page onto the Detail's NavigationPage, the icon that used to open the menu becomes a back button. I want to override this behavior so that icon always opens the menu. I have a subheader with a custom back button which is why I need the Detail to be a NavigationPage.

Answer 1

It's not possible out of the box. maybe using a custom render for the Navigation page.

Answer 2

This is possible now

NavigationPage.SetHasBackButton(page, false);

where page is the page you are about to push.

Answer 3

I found there are a lot of ways to make a new screen pop up with the Master Detail Page. The one that stopped the back button from showing up for me was:

((MasterDetailPage)Application.Current.MainPage).Detail = new NavigationPage(page);

where "page" is whatever screen you want to set it to. For example:

((MasterDetailPage)Application.Current.MainPage).Detail = new NavigationPage(new ResultsPage());