Message graphic color

[MagitekElite]

I have, what most likely, a silly question, but I can't seem to figure out. I was told four times by a few people in the past that if you change the Windowskin, this will also change and I have...but it doesn't seem to change at all. Unless this isn't the method to change it :/

So I changed my windowskin and it worked, or so I thought. The menu graphic changed and so did the title screen graphic, but the message boxes won't change.

(If I'm confusing as usual...I meant this xD)