3D Case support within a Skin..?

Hi

I have tried out a few skins and as yet I can't seem to find one which will display the Blue-ray Case with the 3D symbol when a 3D film has been scraped.
I am not sure of the file naming, which needs to be applied, apart from perhaps needing 3dbd in it...?
Also I am ensuring that the skin is displaying the DVD / BD case and that the suitable view (info wall, low list etc) is shown. Typically each 3D film will show with a std BD case and so I can't easily see the difference between them and a std BD.

Any ideas please...?

Thanks