protected override void OnDisappearing()
 {
     base.OnDisappearing();
     DiagnosisList.FadeTo(0, 1000, Easing.SinInOut);
     doctorDetails.FadeTo(0, 1200, Easing.SinInOut);
     dignosisPage.FadeTo(0, 1400, Easing.SinInOut);
 }
        protected override void OnAppearing()
        {
            base.OnAppearing();
            dignosisPage.Opacity  = 0;
            doctorDetails.Opacity = 0;
            DiagnosisList.Opacity = 0;

            dignosisPage.FadeTo(1, 1000, Easing.SinInOut);
            doctorDetails.FadeTo(1, 1200, Easing.SinInOut);
            DiagnosisList.FadeTo(1, 1400, Easing.SinInOut);
        }