DataContext lost in a ModelVisual3D??? Is it a bug?

Hi all.

At the end of this post I added 2 pieces of code. Basically, the second one is the same as the first one but wrapping the _itemContent with a Viewport3D so that 3D animations are possible on the list items.

In both cases the _itemsContainer.ItemsSource is set in the code behind in the Loaded event handler of the Window.

However, the 2nd code doesnt work and after many experiments I detected that the DataContext is lost. My question is: is this supposed to happen For some reason the VisualBrush "blocks" the cascading of the DataContext Is there another way to create a 3D ItemTemplate

The Templating2 sample here http://msdn.microsoft.com/msdntv/episode.aspx xml=episodes/en/20060202WPFKM/manifest.xml works ok using an ImageBrush and binding the ImageSource="{Binding XPath=@image}", but switching it by a TextBlock within a VisualBrush has the same effect: DataContext is null thus no data is actually shown.

Thanks a lot in advance for any help,

RODOLFO

These are the 2 pieces of XAML code:
<code>
<!-- First piece -->
<ItemsControl x:Name="_itemsContainer" >
<ItemsControl.Panel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.Panel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock x:Name="_itemContent" Background="LightGreen" Width="100" Height="25" Text="{Binding Path=Id}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<!-- End of first piece-->

<!--Second piece -->
<ItemsControl x:Name="_itemsContainer" >
<ItemsControl.Panel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.Panel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Viewport3D x:Name="Foo" Width="100" Height="100">
<Viewport3D.Camera>
<PerspectiveCamera Position="0,0,-6" LookDirection="0,0,1" FieldOfView="18"/>
</Viewport3D.Camera>

<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<GeometryModel3D x:Name="OB_Cube">
<GeometryModel3D.Material>
<DiffuseMaterial x:Name="MA_Material">
<DiffuseMaterial.Brush>
<VisualBrush AutoLayoutContent="True">
<VisualBrush.Visual>
<TextBlock x:Name="_itemContent" Background="LightGreen" Width="100" Height="25" Text="{Binding Path=Id}"/>
</VisualBrush.Visual>
</VisualBrush>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</GeometryModel3D.Material>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<!--End of second piece -->
</code>