>Let me rephrase it. :) I like it because it's faster but visual cue will be very helpful. :) It could be word Preview next to 'Category' field. Something like Preview.

I put something for now. I don't know about red as it is agressive.

>Also, I got an empty frame after the message:

Yes, that part is not done yet. I'll complete that tomorrow. Basically, if a validation message occurs, just hit back for now to go back to the message. This is the last thing that remain to be done for that conversion.