Interceptor Castle/NHibernate general questions

Question

I need some guidance on how the best way of adding interceptors to my project. I use Fluent NHibernate and Castle in my project and below is and example of what I would like to accomplish.

public abstract class ContentItem {
    public virtual int? Id { get; set; }
    public virtual string Name { get; set; }
    public virtual IList<Detail> Details { get; private set; }
    protected ContentItem() {
        Details = new List<Detail>();
    }
    protected virtual object GetDetail(string detailName) {
        // Some logic to get the value of a specific detail from the details collection
    }
    protected virtual void SetDetail<T>(string detailName, T value, T defaultValue) where T : class {
        // Some logic to set the value of a specific detail from the details collection
    }
}

public class Home : ContentItem {
    // This is how I add properties to my ContentItems today
    public virtial string Heading { get { return GetDetail("Heading") as string; } set { SetDetail("Heading", value) } } 

    // This is how I would like to do:
    // Add an interceptor that loads the value into this property
    [Detail]
    public virtual string Heading { get; set; }
    public Home() { }
}

What is the best approach to solve this?