Articad BEDROOMS

Is it just me?
I am having difficulty changing panel colours in sliding doors. For some reason, I can't add a mirror texture into a 3 panelled door. So frustrating. Is it something I am doing or is there an issue with Articad.
Cheers

Are you picking a graphic that offers colour changes in the properties?

Thanks Daz. I am able to change colour but not turn it into a mirror. Not sure what I am doing wrong!

Stumpy, is you preset not working?

It is working okay for me...:

Can you share or PM the *.bed file?

Thanks, Daz. 
The issue is that I needed a 3 door system and the centre door was to have two mirror panels ( top and middle). So I cheated by placing two mirrored cubes over the correct areas. Did not turn out too bad for a bodge job.
Thanks for your offer. I will take you up on your help on an important job. Not silly slidders!
Cheers