Override built-in mouse-over?

I have a TON of guiBitmapButtonControl objects in my GUI file. I have my own custom mouse-over image setup for them and it works perfectly. The problem is, the game seems to have its own built-in mouse-over thing that changes the color of my text from white to an ugly teal color. Is there any way to override that so it stays white but still shows my custom mouse-over graphics?