Setting Canvas.Left within a ContentPresenter style seems to be ignored

Question

Hi guys,

 I have an ItemsControl with the ItemsPanel set to Canvas. I am setting the Canvas.Left, Canvas.Top properties for the container however doesn't seem to work. Same approach works fine in WPF. Here is the mainpage.xaml.h

[Windows::UI::Xaml::Data::BindableAttribute]
	public ref class Item sealed
	{
	public:
		property double X;
		property double Y;

		property double W;
		property double H;

	};

	/// <summary>
	/// An empty page that can be used on its own or navigated to within a Frame.
	/// </summary>
	[Windows::UI::Xaml::Data::BindableAttribute]
	public ref class MainPage sealed
	{
	public:
		MainPage();

		property Windows::Foundation::Collections::IVector<Item^>^ Items
		{
			 Windows::Foundation::Collections::IVector<Item^>^  get()
			 {
				 return _items;
			 }
		}
	protected:
		
		virtual void OnNavigatedTo(Windows::UI::Xaml::Navigation::NavigationEventArgs^ e) override;

	private:
		Windows::Foundation::Collections::IVector<Item^>^ _items;
	};

here is the ctor for the MainPage.xaml.cpp

MainPage::MainPage()
{
	_items = ref new Vector<Item^>();
	auto item = ref new Item();
	item->X = 100;
	item->Y = 20;
	item->W = 40;
	item->H  = 40;
	_items->Append(item);

	item = ref new Item();
	item->X = 200;
	item->Y = 120;
	item->W = 40;
	item->H  = 40;
	_items->Append(item);

	item = ref new Item();
	item->X = 100;
	item->Y = 320;
	item->W = 70;
	item->H  = 340;
	_items->Append(item);
	DataContext = this;

	InitializeComponent();

	

}

and the MainPage.xaml

<Page
    x:Class="App1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App1"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <ItemsControl ItemsSource="{Binding Items}" Background="LightCoral" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <Canvas  Background="Black"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Rectangle Fill="White" Stroke="Green" StrokeThickness="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
            <ItemsControl.ItemContainerStyle>
                <Style TargetType="ContentPresenter">
                    <Setter Property="Canvas.Left" Value="{Binding X}"/>
                    <Setter Property="Canvas.Top" Value="{Binding Y}"/>
                    <Setter Property="Width" Value="{Binding W}"/>
                    <Setter Property="Height" Value="{Binding H}"/>
                </Style>
            </ItemsControl.ItemContainerStyle>
        </ItemsControl>
    </Grid>
</Page>

Any idea how to get this working?

Regards,

 Stefan