WPF ItemsPresenter

Question

In the following XAML:

<Window.Resources>
	<ControlTemplate x:Key="ListTemplate">
		<Grid>
			<ItemsPresenter TextBlock.Foreground="Blue"/>
		</Grid>
	</ControlTemplate>
</Window.Resources>
<Grid>
	<ListBox Name="listCars" DisplayMemberPath="Model"
				Template="{StaticResource ListTemplate}"/>
</Grid>

I do not understand why the ItemsPresenter specifies a TextBlock. Where does the documentation explain that?