Modifying NewsRotator Sample to use custom field image selec

Problem:
The problem I am having is that I am not able to retrieve a custom field value added to the News module. I am trying to retreive the value  in the RadRotator1_ItemDataBound event.

Objective
To use a thumbnail selector added to the News Module, in combination with the SDK NewsRotator Sample. I successully implemented a thumbnail selector as a custom field by following the article:

 http://www.sitefinity.com/blogs/slavoingilizov/posts/11-09-09/extend_the_image_selector_for_content_items_with_filtering_by_album.aspx


I then modified the dataSource in the NewsRotator Sample

Old DataSource

var dataSource = App.WorkWith().NewsItems()  

.Where(n => n.Status ==  ContentLifecycleStatus.Live)

 .Get().Take(this.NewsLimit)

 .ToList()

.Join(App.WorkWith().Images()

 .Get()

.Where(i => i.Parent.Title == "Thumbnails" && i.Status == ContentLifecycleStatus.Live),

 item => item.Title.Value,

image => image.Title.Value,

(item, image) =>

 new NewsItem = item, NewsImage = image   

);

var dataSource = App.WorkWith().NewsItems()

.Where(n => n.Status == ContentLifecycleStatus.Live)

.Get().Take(this.NewsLimit);

After modify the datasource the line of code that gets the news item in RadRotator1_ItemDataBound stopped working. I'm not sure if the following was the correct thing to do, however, it did get rid of an error. I changed the following line of code.

Old line of code

NewsItem newsItem = (NewsItem)TypeDescriptor.GetProperties(e.Item.DataItem)["NewsItem"].GetValue(e.Item.DataItem);

NewsItem newsItem = (NewsItem)e.Item.DataItem;

 
At this point the NewsRotator is functional except that it does not display images.

Where it's not working
In RadRotator1_ItemDataBound I added the following code

if (newsItem.GetValue("Thumbnail") != null)

    string thumbnail = newsItem.GetValue("Thumbnail").ToString();

The problem is that newsItem.GetValue("Thumbnail") is always returning null.

I found the problem but will leave the thread open in case I have any more question.

Instead of this:

newsItem.GetValue(

"Thumbnail") 

Use this:

newsItem.GetValue<string>("Thumbnail")