What's wrong with this aspect

I want this to be called when the property is set. Why doesn't it work?

[DirtyTrackingAttribute(AttributeTargetElements =
   PostSharp.Extensibility.MulticastTargets.Property)]
class Program
{

    public static string Test { get; set; }

    static void Main(string[] args)
    {
        TestIt();
        Test = "foo";
        Console.ReadKey();
    }

    private static void TestIt()
    {
      Console.WriteLine("Real method called");
    }
}

[Serializable]
public class DirtyTrackingAttribute : OnMethodInvocationAspect
{
    public override void OnInvocation(MethodInvocationEventArgs eventArgs)
    {
        Console.WriteLine("Property invoked");
        eventArgs.Proceed();
    }
}