Emitter textures not shown at the rendered viewport

I try to setup some textured emitters, but I can’t see the texture at the viewport. Looks like a bug. Is there a workaround?

Emissive material’s Color texture (only TexBitmap) is displayed in the Rhino viewport. Just keep in mind the displayed texture is multiplied with the emissive color so high value colors may make the texture unnoticeable.

Kind regards,
Peter