embedding a xamarin forms content page - xamarin.forms

Question

I have been trying to embed a ContentPage in UWP following this tutorial
My code is rather simple, here is my content page :
<?xml version="1.0" encoding="utf-8" ?>
<local:CustomContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="NavigationPannel2.PageTest1"
xmlns:local="clr-namespace:NavigationPannel2"
BackgroundColor="Aqua">
<ContentPage.Content>
<Grid>
<Button Text="To Page 2"
Clicked="Button_Clicked"/>
</Grid>
</ContentPage.Content>
</local:CustomContentPage>
(CustomContentPage just adds a custom navigation event :)
using System;
using System.Collections.Generic;
using System.Text;
using Xamarin.Forms;
namespace NavigationPannel2
{
public class CustomContentPage : ContentPage
{
public EventHandler<NavigateEvent> navigation_push_event;
public CustomContentPage()
{
}
}
}
I initialize Forms.Init() in OnLaunched :
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
namespace NavigationPannel2.UWP
{
/// <summary>
/// Provides application-specific behavior to supplement the default Application class.
/// </summary>
sealed partial class App : Application
{
/// <summary>
/// Initializes the singleton application object. This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
/// </summary>
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
}
/// <summary>
/// Invoked when the application is launched normally by the end user. Other entry points
/// will be used such as when the application is launched to open a specific file.
/// </summary>
/// <param name="e">Details about the launch request and process.</param>
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
Xamarin.Forms.Forms.Init(e);
Frame rootFrame = Window.Current.Content as Frame;
// Do not repeat app initialization when the Window already has content,
// just ensure that the window is active
if (rootFrame == null)
{
// Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
Xamarin.Forms.Forms.Init(e);
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
// Place the frame in the current Window
Window.Current.Content = rootFrame;
}
if (rootFrame.Content == null)
{
// When the navigation stack isn't restored navigate to the first page,
// configuring the new page by passing required information as a navigation
// parameter
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
// Ensure the current window is active
Window.Current.Activate();
}
/// <summary>
/// Invoked when Navigation to a certain page fails
/// </summary>
/// <param name="sender">The Frame which failed navigation</param>
/// <param name="e">Details about the navigation failure</param>
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
/// <summary>
/// Invoked when application execution is being suspended. Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory still intact.
/// </summary>
/// <param name="sender">The source of the suspend request.</param>
/// <param name="e">Details about the suspend request.</param>
private void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: Save application state and stop any background activity
deferral.Complete();
}
}
}
And I use this page as content for my UWP MainPage :
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Xamarin.Forms;
using Xamarin.Forms;
using Xamarin.Forms.Platform.UWP;
using Windows.UI.Core;
namespace NavigationPannel2.UWP
{
public sealed partial class MainPage
{
public MainPage()
{
this.InitializeComponent();
LoadApplication(new NavigationPannel2.App());
CustomContentPage page = new PageTest1();
Content = page.CreateFrameworkElement();
}
}
}
But the page seems to have lost its dynamic layout : when i resize the window everything stays still…
How Can I solve this ?