VirtualizingWrapPanel CodePlex Mirror https://uhimaniavwp.codeplex.com/
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vwp="clr-namespace:CodePlex.VirtualizingWrapPanel;assembly=VirtualizingWrapPanel"
Title="MainWindow" Height="350" Width="525">
<Grid>
<ListBox>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<vwp:VirtualizingWrapPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</Grid>
</Window>
Microsoft Public License (Ms-PL)