Mono Fragment之间转换

    var newFragment = new mybacklogF ();
            var ft = FragmentManager.BeginTransaction ();
            ft.Replace (Resource.Id.main_FragmentContainer, newFragment,"Homepage");
            ft.AddToBackStack ("Homepage");
            ft.Commit ();

Button btnBack = view.FindViewById<Button> (Resource.Id.LEFT_BUTTON);
            btnBack.Visibility = ViewStates.Visible;
            btnBack.Click += (object sender, EventArgs e) => {
                FragmentManager.PopBackStack();
            };