How to properly bind a ListBoxItem in WPF?

I have a listbox and I want to iterate over a collection of Bars in my Foo-object.

<ListBox DataContext="{Binding Path=Foo.Bars}" >
    <ListBox.Items>
        <ListBoxItem>
            <ContentControl DataContext="{Binding Path=.}" />
        </ListBoxItem>
    </ListBox.Items>
</ListBox>

This is the datatemplate I want to use.

<DataTemplate DataType="{x:Type Bar}">
        <Label Content="hello stackoverflow" />
</DataTemplate>

If I snoop (--> examine by using the tool Snoop) my application, I notice that the entire collection of Bars is bound to the ContentControl, in stead of just 1.

How can I properly bind so the iteration over the collection goes fine?