VS2010 (Blend 3) 中不存在标签“Interaction.Behaviors”

csharp
using System.Windows;
using System.Windows.Controls;
using System.Windows.Interactivity;
namespace InteractionBehaviorsExample
{
    public class MessageBoxBehavior : Behavior<Button>
    {
        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.Click += ShowMessageBox;
        }
        protected override void OnDetaching()
        {
            base.OnDetaching();
            AssociatedObject.Click -= ShowMessageBox;
        }
        private void ShowMessageBox(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Hello, Interaction.Behaviors!");
        }
    }
}

xaml
<Window x:Class="InteractionBehaviorsExample.MAInWindow"</p>        XMLns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        XMLns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        XMLns:local="clr-namespace:InteractionBehaviorsExample"
        Title="MAInWindow" Height="350" Width="525">
    <Grid>
        <Button Content="Click me">
            <local:MessageBoxBehavior/>
        </Button>
    </Grid>
</Window>