Data Template not injected in ItemContainer - wpf

Question

I have an ItemsControl class that overrides the following methods:
protected override bool IsItemItsOwnContainerOverride(object item)
{
return item is TilePanelItem;
}
protected override DependencyObject GetContainerForItemOverride()
{
return new TilePanelItem();
}
I provided the template for TilePanelItem which is the container of ItemsControl:
<ControlTemplate x:Key="tileItemTemplate" TargetType="my:TilePanelItem">
<Grid Width="200" Height="100">
<Border BorderBrush="Black" BorderThickness="2">
<ContentPresenter RenderTransformOrigin=".5,.5" />
</Border>
</Grid>
</ControlTemplate>
And the Style for it:
<Style TargetType="my:TilePanelItem">
<Setter Property="Template" Value="{StaticResource tileItemTemplate}" />
</Style>
And finally the instance of my ItemsControl with the DataTemplate:
<my:TileItemsControl x:Name="tileControl" ItemsSource="{Binding}" >
<my:TileItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel />
</ItemsPanelTemplate>
</my:TileItemsControl.ItemsPanel>
<my:TileItemsControl.ItemTemplate>
<DataTemplate>
<Border Background="Blue">
<TextBlock Text="here I am" />
</Border>
</DataTemplate>
</my:TileItemsControl.ItemTemplate>
</my:TileItemsControl>
The DataTemplate that I defined is not injected in ItemContainer. When I run the app, it shows the borders as I declared in ItemContainter template but I don't see the DataTemplate.
What am I missing?
Thanks a million

Answer 1

You need to bring the ItemsTemplate in to become the ContentPresenter's ContentTemplate:
<ControlTemplate x:Key="tileItemTemplate" TargetType="my:TilePanelItem">
<Grid Width="200" Height="100">
<Border BorderBrush="Black" BorderThickness="2">
<ContentPresenter RenderTransformOrigin=".5,.5"
ContentTemplate="{Binding ItemsTemplate, RelativeSource={RelativeSource FindAncestor,my:TileItemsControl,1}}" />
</Border>
</Grid>
</ControlTemplate>