PanContainer.cs

double x, y;

		public PanContainer ()
		{
			// Set PanGestureRecognizer.TouchPoints to control the 
			// number of touch points needed to pan
			var panGesture = new PanGestureRecognizer ();
			panGesture.PanUpdated += OnPanUpdated;
			GestureRecognizers.Add (panGesture);
		}

		void OnPanUpdated (object sender, PanUpdatedEventArgs e)
		{
			switch (e.StatusType) {

			case GestureStatus.Running:
				// Translate and ensure we don't pan beyond the wrapped user interface element bounds.
				Content.TranslationX = Math.Max (Math.Min (0, x + e.TotalX), -Math.Abs (Content.Width - App.ScreenWidth));
				Content.TranslationY = Math.Max (Math.Min (0, y + e.TotalY), -Math.Abs (Content.Height - App.ScreenHeight));	
                break;
			
			case GestureStatus.Completed:
				// Store the translation applied during the pan
				x = Content.TranslationX;
				y = Content.TranslationY;
				break;
			}
		}
	}
}