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();            };