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copied!<p>I had to calculate the desired height by getting the ScrollViewer's content desired height and adding the ScrollBar height if visible.</p> <p>This still feels slightly awkward to me, so if you have a better solution, I'll gladly change the accepted answer.</p> <pre><code>public class HeightChangedBehavior : Behavior<ScrollViewer> { public ICommand HeightChangedCommand { get { return (ICommand)GetValue(HeightChangedCommandProperty); } set { SetValue(HeightChangedCommandProperty, value); } } public static readonly DependencyProperty HeightChangedCommandProperty = DependencyProperty.Register("HeightChangedCommand", typeof(ICommand), typeof(HeightChangedBehavior), new PropertyMetadata(null)); protected override void OnAttached() { this.AssociatedObject.ScrollChanged += AssociatedObject_ScrollChanged; base.OnAttached(); } /// <summary> /// Calculates the desired height for the scrollviewer, as the sum of its content /// desired height and, if visible, the horizontal scrollbar height. /// </summary> void AssociatedObject_ScrollChanged(object sender, ScrollChangedEventArgs e) { ScrollViewer sv = (ScrollViewer)sender; // get content height double height = ((FrameworkElement)sv.Content).DesiredSize.Height; if (sv.ComputedHorizontalScrollBarVisibility == Visibility.Visible) { // add scrollbar height height += (double)sv.FindResource(SystemParameters.HorizontalScrollBarHeightKey); // template of scrollbar should use this key } int intHeight = (int)Math.Ceiling(height); // whole pixels // execute the command ICommand cmd = this.HeightChangedCommand; if (cmd != null && intHeight != sv.ActualHeight) cmd.Execute(intHeight); } } </code></pre>

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