If I understood correctly, you just have to select your header columns, then go to the Property windows in VS and in color selection window go to Expressions. From there you can choose how exactly you will pass the color to the expression. You can pass it like text (for example "Black" will color your cells in black, but here you have to stick only with the predefined colors in VS). Another way is just pass the RGB value of the color like #9b1212.

I hope this might help you. Let me know if I can help you on that further more.

/ivan