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    <p>Okay, here's the answer I came up with for myself.</p> <p>I figured out that there is a GetSelfAndAncestors method for dependency objects. Using that, I am able to get the ScrollViewer ancestor(if there is one) of my AssociatedObject(the ItemsControl) and manipulate it with that.</p> <p>So I added this field to my behavior</p> <pre><code>private ScrollViewer scrollViewer; private bool isScrollDownEnabled; </code></pre> <p>And in the OnLoaded event handler I assigned it with the following code</p> <pre><code>scrollViewer = AssociatedObject.GetSelfAndAncestors().Where(a =&gt; a.GetType().Equals(typeof(ScrollViewer))).FirstOrDefault() as ScrollViewer; </code></pre> <p>And in the OnCollectionChanged event handler, I went ahead and wrapped all the logic in an if statement as follows</p> <pre><code> if (scrollViewer != null) { isScrollDownEnabled = scrollViewer.ScrollableHeight &gt; 0 &amp;&amp; scrollViewer.VerticalOffset + scrollViewer.ViewportHeight &lt; scrollViewer.ExtentHeight; if (e.Action == NotifyCollectionChangedAction.Add &amp;&amp; !isScrollDownEnabled) { // Do stuff } } </code></pre> <p>So all together, the code looks like the following</p> <pre><code>public class ScrollOnNewItem : Behavior&lt;ItemsControl&gt; { private ScrollViewer scrollViewer; private bool isScrollDownEnabled; protected override void OnAttached() { AssociatedObject.Loaded += OnLoaded; AssociatedObject.Unloaded += OnUnLoaded; } protected override void OnDetaching() { AssociatedObject.Loaded -= OnLoaded; AssociatedObject.Unloaded -= OnUnLoaded; } private void OnLoaded(object sender, RoutedEventArgs e) { var incc = AssociatedObject.ItemsSource as INotifyCollectionChanged; if (incc == null) return; incc.CollectionChanged += OnCollectionChanged; scrollViewer = AssociatedObject.GetSelfAndAncestors().Where(a =&gt; a.GetType().Equals(typeof(ScrollViewer))).FirstOrDefault() as ScrollViewer; } private void OnUnLoaded(object sender, RoutedEventArgs e) { var incc = AssociatedObject.ItemsSource as INotifyCollectionChanged; if (incc == null) return; incc.CollectionChanged -= OnCollectionChanged; } private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { if (scrollViewer != null) { isScrollDownEnabled = scrollViewer.ScrollableHeight &gt; 0 &amp;&amp; scrollViewer.VerticalOffset + scrollViewer.ViewportHeight &lt; scrollViewer.ExtentHeight; if (e.Action == NotifyCollectionChangedAction.Add &amp;&amp; !isScrollDownEnabled) { int count = AssociatedObject.Items.Count; if (count == 0) return; var item = AssociatedObject.Items[count - 1]; var frameworkElement = AssociatedObject.ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement; if (frameworkElement == null) return; frameworkElement.BringIntoView(); } } } } </code></pre> <p>As asked in the comments, to use a behavior, I just need to add a new xmlns to my xaml file of the area in code that contains my behavior.</p> <pre><code> xmlns:behaviors="clr-namespace:Infrastructure.Behaviors;assembly=Infrastructure" </code></pre> <p>Then on the control I just add on the behavior.</p> <pre><code> &lt;ScrollViewer VerticalScrollBarVisibility="Auto"&gt; &lt;ItemsControl Name="Blah" ItemsSource="{Binding Messages}" ItemTemplate="{StaticResource MessageTemplate}"&gt; &lt;i:Interaction.Behaviors&gt; &lt;behaviors:ScrollOnNewItem /&gt; &lt;/i:Interaction.Behaviors&gt; &lt;/ItemsControl&gt; &lt;/ScrollViewer&gt; </code></pre> <p>The <strong>i</strong> class is just the interactivity namespace. <strong>xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"</strong></p>
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    1. POHow to get ItemsControl scrollbar position programmatically?
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    1. COWould be better if you provide the code how to use this class!
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    2. COI went ahead and edited the bottom to show how to use it. It's just a matter of adding a behavior to the item in question in the view.
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    3. COThanks for extending your answer! +1
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