//usage:

		// ContactGrid is the x:Name of the Grid within the ScrollView
		protected override void OnAppearing()
		{
			base.OnAppearing();
			ContactGrid.LayoutStars(((float)App.INSTANCE.Resources["PageHeight"]));
		}

//In your MainActivity:


		private void InitAppResources()
		{
			App.INSTANCE.Resources["StatusBarHeight"] = GetStatusBarHeight() / Resources.DisplayMetrics.Density;
			App.INSTANCE.Resources["NavBarHeight"] = GetNavBarHeight() / Resources.DisplayMetrics.Density;
			App.INSTANCE.Resources["screenHeight"] = Resources.DisplayMetrics.HeightPixels / Resources.DisplayMetrics.Density;
			App.INSTANCE.Resources["screenWidth"] = Resources.DisplayMetrics.WidthPixels / Resources.DisplayMetrics.Density;
			App.INSTANCE.Resources["screenDensity"] = Resources.DisplayMetrics.Density;
			App.INSTANCE.Resources["PageHeight"] = (Resources.DisplayMetrics.HeightPixels - GetStatusBarHeight() - GetNavBarHeight()) / Resources.DisplayMetrics.Density;
		}

		private int GetNavBarHeight()
		{
			int resourceId = Resources.GetIdentifier("navigation_bar_height", "dimen", "android");
			if (resourceId > 0)
			{
				return Resources.GetDimensionPixelSize(resourceId);
			}
			return 0;
		}

		private int GetStatusBarHeight()
		{
			int resourceId = Resources.GetIdentifier("status_bar_height", "dimen", "android");
			if (resourceId > 0)
			{
				return Resources.GetDimensionPixelSize(resourceId);
			}
			return 0;
		}

//In your AppDelegate:


        private void InitAppResources()
        {
            App.INSTANCE.Resources["statusBarHeight"] = (float)(40 / UIScreen.MainScreen.NativeScale);
            App.INSTANCE.Resources["navBarHeight"] = (float)(88 / UIScreen.MainScreen.NativeScale);
            App.INSTANCE.Resources["screenHeight"] = (float)(UIScreen.MainScreen.NativeBounds.Height / UIScreen.MainScreen.NativeScale);
            App.INSTANCE.Resources["screenWidth"] = (float)(UIScreen.MainScreen.NativeBounds.Width / UIScreen.MainScreen.NativeScale);
            App.INSTANCE.Resources["screenDensity"] = (float)UIScreen.MainScreen.NativeScale;
            App.INSTANCE.Resources["pageHeight"] = (float)((UIScreen.MainScreen.NativeBounds.Height - 40 - 88) / UIScreen.MainScreen.NativeScale);
		}