I remember seen some code xaml where can get the first element (like an index x[0]) from a collection.

This is my CollectionViewSource from Resources.

```
<CollectionViewSource
            x:Name="groupedItemsViewSource2"
            Source="{Binding Posters}"
            ItemsPath="Posters" />

```

If I display this in a listbox, it loaded it!

```
<ListBox ItemsSource="{Binding Source={StaticResource groupedItemsViewSource2}}" />

```

But right now, I just want to get the first element through xaml. Is it possible doing this?