The following example shows how to bind to an XML data source and virtualize the items displayed in a ListBox element by using XAML. Notice that the IsVirtualizing attached property is explicitly set to true.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowTitle="VirtualizingStackPanel Sample"
Height="150"
VerticalAlignment="Top">
<Page.Resources>
<XmlDataProvider x:Key="Leagues" Source="Leagues.xml" XPath="Leagues/League"/>
<DataTemplate x:Key="NameDataStyle">
<TextBlock Text="{Binding XPath=@name}" FontFamily="Arial" FontSize="12" Foreground="Black"/>
</DataTemplate>
</Page.Resources>
<Border HorizontalAlignment="Left"
VerticalAlignment="Top"
BorderBrush="Black"
BorderThickness="2">
<ScrollViewer>
<StackPanel DataContext="{Binding Source={StaticResource Leagues}}">
<TextBlock Text="{Binding XPath=@name}" FontFamily="Arial" FontSize="18" Foreground="Black"/>
<ListBox VirtualizingStackPanel.IsVirtualizing="True"
ItemsSource="{Binding XPath=Team}"
ItemTemplate="{DynamicResource NameDataStyle}"/>
</StackPanel>
</ScrollViewer>
</Border>
</Page>