Change Hamburger Icon Xamarin.Forms Android

Good Morning. I'm struggling in finding a way to change the default hamburger icon in Xamarin.Forms Master-Detail Page on Android.
I tried both to change the icon for the master page (but it works just on iOS) and change it manually in the MainActivity.
I'm using the new FormsAppCompatActivity base class but I can't find a way to modify the ActionBarDrawerToggle as suggested at http://bit.ly/2gv3iZk and still use the ToolbarResource property from FormsAppCompatActivity.
I guess the problem in FormsAppCompatActivity base class.
Forms expect to inflate the ToolBar here from the ToolbarResource layout id. I also tried reproduce the OnCreate via reflection but nothing worked.