<Button ...>
  <i:Interaction.Behaviors>
    <local:MyBehavior />
  </i:Interaction.Behaviors>
</Button>

<Grid>
    <Grid.Resources>
        <sys:String x:Key="stringResource1">stringResource1</sys:String>
        <local:Triggers x:Key="debugTriggers" x:Shared="False">
            <i:EventTrigger EventName="MouseLeftButtonDown">
                <local:DebugAction Message="DataContext: {0}" MessageParameter="{Binding}"/>
                <local:DebugAction Message="ElementName: {0}" MessageParameter="{Binding Text, ElementName=textBlock2}"/>
                <local:DebugAction Message="Mentor: {0}" MessageParameter="{Binding Text, RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}}"/>
            </i:EventTrigger>
        </local:Triggers>
        <Style x:Key="debugBehavior" TargetType="FrameworkElement">
            <Setter Property="local:SupplementaryInteraction.Triggers" Value="{StaticResource debugTriggers}"/>
        </Style>
    </Grid.Resources>
    <StackPanel DataContext="{StaticResource stringResource1}">
        <TextBlock Name="textBlock1" Text="textBlock1" Style="{StaticResource debugBehavior}"/>
        <TextBlock Name="textBlock2" Text="textBlock2" Style="{StaticResource debugBehavior}"/>
        <TextBlock Name="textBlock3" Text="textBlock3" Style="{StaticResource debugBehavior}"/>
    </StackPanel>
</Grid>

public class DebugAction : TriggerAction<DependencyObject>
{
    public string Message
    {
        get { return (string)GetValue(MessageProperty); }
        set { SetValue(MessageProperty, value); }
    }

    public static readonly DependencyProperty MessageProperty =
        DependencyProperty.Register("Message", typeof(string), typeof(DebugAction), new UIPropertyMetadata(""));

    public object MessageParameter
    {
        get { return (object)GetValue(MessageParameterProperty); }
        set { SetValue(MessageParameterProperty, value); }
    }

    public static readonly DependencyProperty MessageParameterProperty =
        DependencyProperty.Register("MessageParameter", typeof(object), typeof(DebugAction), new UIPropertyMetadata(null));

    protected override void Invoke(object parameter)
    {
        Debug.WriteLine(Message, MessageParameter, AssociatedObject, parameter);
    }
}

public class Behaviors : List<Behavior>
{
}

public class Triggers : List<TriggerBase>
{
}

public static class SupplementaryInteraction
{
    public static Behaviors GetBehaviors(DependencyObject obj)
    {
        return (Behaviors)obj.GetValue(BehaviorsProperty);
    }

    public static void SetBehaviors(DependencyObject obj, Behaviors value)
    {
        obj.SetValue(BehaviorsProperty, value);
    }

    public static readonly DependencyProperty BehaviorsProperty =
        DependencyProperty.RegisterAttached("Behaviors", typeof(Behaviors), typeof(SupplementaryInteraction), new UIPropertyMetadata(null, OnPropertyBehaviorsChanged));

    private static void OnPropertyBehaviorsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var behaviors = Interaction.GetBehaviors(d);
        foreach (var behavior in e.NewValue as Behaviors) behaviors.Add(behavior);
    }

    public static Triggers GetTriggers(DependencyObject obj)
    {
        return (Triggers)obj.GetValue(TriggersProperty);
    }

    public static void SetTriggers(DependencyObject obj, Triggers value)
    {
        obj.SetValue(TriggersProperty, value);
    }

    public static readonly DependencyProperty TriggersProperty =
        DependencyProperty.RegisterAttached("Triggers", typeof(Triggers), typeof(SupplementaryInteraction), new UIPropertyMetadata(null, OnPropertyTriggersChanged));

    private static void OnPropertyTriggersChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var triggers = Interaction.GetTriggers(d);
        foreach (var trigger in e.NewValue as Triggers) triggers.Add(trigger);
    }
}

#region Attached Properties Boilerplate

    public static readonly DependencyProperty IsActiveProperty = DependencyProperty.RegisterAttached("IsActive", typeof(bool), typeof(ScrollIntoViewBehavior), new PropertyMetadata(false, OnIsActiveChanged));

    public static bool GetIsActive(FrameworkElement control)
    {
        return (bool)control.GetValue(IsActiveProperty);
    }

    public static void SetIsActive(
      FrameworkElement control, bool value)
    {
        control.SetValue(IsActiveProperty, value);
    }

    private static void OnIsActiveChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var behaviors = Interaction.GetBehaviors(d);
        var newValue = (bool)e.NewValue;

        if (newValue)
        {
            //add the behavior if we don't already have one
            if (!behaviors.OfType<ScrollIntoViewBehavior>().Any())
            {
                behaviors.Add(new ScrollIntoViewBehavior());
            }
        }
        else
        {
            //remove any instance of the behavior. (There should only be one, but just in case.)
            foreach (var item in behaviors.ToArray())
            {
                if (item is ScrollIntoViewBehavior)
                    behaviors.Remove(item);
            }
        }
    }


    #endregion

<Style TargetType="Button">
    <Setter Property="Blah:ScrollIntoViewBehavior.IsActive" Value="True" />
</Style>