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    copied!<p>All righty per this post:</p> <p><a href="https://stackoverflow.com/questions/2783845/wpf-virtualizing-an-itemscontrol">Virtualizing a WPF ItemsControl</a></p> <p>I didn't have the <strong>Scrollviewer.CanScroll='true'</strong> in WPF virtualizationstackpanel doesn't seem to work without it. </p> <p>Thanks all who posted solutions to help me along the way. You guys didn't have the solution so I didn't mark it as correct; however, I gave you guys upvotes because you both helped along the way. Here's the final XAML so you can see what the itemscontrol needs to look like:</p> <pre><code> &lt;ItemsControl ScrollViewer.CanContentScroll="True" VirtualizingStackPanel.VirtualizationMode="Recycling" ItemsSource="{Binding UsersAvailForEmail}" MaxHeight="400"&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;VirtualizingStackPanel /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;ItemsControl.Template&gt; &lt;ControlTemplate&gt; &lt;ScrollViewer x:Name="ScrollViewer" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto" IsDeferredScrollingEnabled="True" Padding="{TemplateBinding Padding}"&gt; &lt;ItemsPresenter/&gt; &lt;/ScrollViewer&gt; &lt;/ControlTemplate&gt; &lt;/ItemsControl.Template&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Border Style="{StaticResource onmouseover}" BorderThickness="0,0,1,1"&gt; &lt;CheckBox Margin="20,5" IsChecked="{Binding IsSelected}"&gt; &lt;CheckBox.Content&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;TextBlock Width="20"/&gt; &lt;TextBlock Width="70" Style="{StaticResource textBlockBaseStyle}" Grid.Column="1" Text="{Binding FirstName}"/&gt; &lt;TextBlock Width="70" Style="{StaticResource textBlockBaseStyle}" Grid.Column="2" Text="{Binding LastName}"/&gt; &lt;TextBlock Width="70" Style="{StaticResource textBlockBaseStyle}" Grid.Column="3" Text="{Binding Action}"/&gt; &lt;TextBlock Width="60" Style="{StaticResource textBlockBaseStyle}" Grid.Column="4" Text="{Binding ActionId}"/&gt; &lt;/StackPanel&gt; &lt;/CheckBox.Content&gt; &lt;/CheckBox&gt; &lt;/Border&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;/ItemsControl&gt; </code></pre>
 

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