AutoScroll

The AutoScroll behavior automatically scrolls to a specific direction when the ItemsSource of an ItemsControl changes.

1) Add the following XML namespaces:

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:catel="http://catel.codeplex.com"

2) Add behavior

<ListBox ItemsSource="{Binding LogEntries}">
    <i:Interaction.Behaviors>
        <catel:AutoScroll ScrollDirection="Bottom" ScrollTreshold="10" />
    </i:Interaction.Behaviors>
</ListBox>

The ScrollDirection determines the direction (Top or Bottom).

The ScrollTreshold allows the treshold of the real offset (to determine whether auto scroll should be enabled). For example, when the user is manually scrolling, this behavior will pause.