TV Show Shelf thumbnail

Not sure how to explain this clearly so please bare with me.

I using the latest version of Firecore on an ATV2 running 5.0.1

All my media is on a NAS.

When I play a movie the latest shows up with the Movie Art work.

When I play a TV show it shows the Thumbnail on the Show. I have setup folders for my TV shows

 Example

Nikita

-       Season 1

o   S01E01 – xxx.avi

o   S01E02 – xxx.avi

o   S01E03 – xxx.avi

At the top level when I browse Folders I have setup an image to display the a custom image.

When I play a file, how do I get this image to be displayed in the Shelf on the main screen instead of the thumbnail. 

Some shows I have setup in more flat structure

Nikita

o   S01E01 – xxx.avi

o   S01E02 – xxx.avi

o   S01E03 – xxx.avi