Woodworking: Can I use glaze or is there another product I can try on my cabinets?

I have cabinets that are finished and sealed, and I believe they are probably veneer. I have read alot about glazing online where the furniture people are using a glaze or other product to change to appearance, and from what I understand, it can be applied without having to sand the project first. From what I've read, most use some sort of CV sealer, then add the colorant on top of this layer. I have natural colored oak type cabinets, just the raw oak color with clear top coat. I would like to darken them considerably, but still allow the grain to show. Would glazing work, or is there some kind of dye I could apply over the finished wood? Even if I had to apply a clear primer, that would be OK, but since the cabinets are partially veneer, it rules out being able to sand and re-stain to change their color. They would not have to be so perfect as to match other things, but, if they could come out with a red cherry to mohogany color, I'd be very pleased. Advice? Info links?