Xamarin.Forms 1.3 - TabbedPage with ContentPage ListView.SelectItem preservation when OnCurrentPageChanged

MyTabbedPage.cs

using System;
using System.Collections.Generic;

using Xamarin.Forms;

namespace MyProject
{
	public class MyTabbedPage : TabbedPage
	{
		private Type _lastPage { get; set; }

		void OnCurrentPageChanged (object sender, EventArgs e)
		{
			if (_lastPage == typeof(Page1)) {
				MessagingCenter.Send<MyTabbedPage> (this, "CurrentPageChangedFrom");
			} else {
				//MessagingCenter.Send<MyTabbedPage> (this, "CurrentPageChangedTo");
			}
			_lastPage = sender.GetType();
		}

		public MyTabbedPage ()
		{
			this.Title = "Some Editor";

			this.Children.Add (new MyPage1 ());
			//this.Children [0].Icon = "icons/edit24.png";
			this.Children.Add (new MyPage2 ());
			//this.Children [1].Icon = "icons/mobile29.png";
			this.Children.Add (new MyPage3 ());
			//this.Children [2].Icon = "icons/book95.png";
			this.Children.Add (new MyPage4 ());
			//this.Children [3].Icon = "icons/cogs3.png";

			_lastPage = typeof(MyPage1);

			this.CurrentPageChanged += OnCurrentPageChanged;
		}
	}
}

Page1.cs

using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

using Xamarin.Forms;

namespace MyProject
{
	public class Page1 : ContentPage
	{
	    private ListView _myListView { get; set; }
	    
		private object _scrollItem { get; set; }

		public void OnPageAppearing (object sender, EventArgs e)
		{
			if(this._scrollItem != null) {
				Foo fooScrollItem = (Foo)_scrollItem;
				foreach(Foo fooItem in _myListView.ItemsSource) {
					if(fooItem.Index == fooScrollItem.Index) {
						_myListView.SelectedItem = fooItem;
						_myListView.ScrollTo(fooItem, ScrollToPosition.Center, true);
						break;
					}
				}
			}
		}
		
		public void OnMyListViewItemSelected (object sender, SelectedItemChangedEventArgs e)
		{
			this._scrollItem = e.SelectedItem;
		}
		
		public Page1()
		{
			this.Appearing += OnPageAppearing;

			MessagingCenter.Subscribe<MyTabbedPage> (this, "CurrentPageChangedFrom", (sender) => {
				if(_myListView.SelectedItem != null) {
					this._scrollItem = _myListView.SelectedItem;
				} else {
					this._scrollItem = null;
				}
			});

			_myListView = new ListView {
				HorizontalOptions = LayoutOptions.FillAndExpand, 
				VerticalOptions = LayoutOptions.StartAndExpand,
				HasUnevenRows = true
			};

			_myListView.ItemSelected += OnMyListViewItemSelected;

			Content = new StackLayout {
                VerticalOptions = LayoutOptions.FillAndExpand,
                Children = { _myListView }
            };
		}
	}
}