I had also trouble doing that directly in WB Modify style. Changing system colors may have worked the first time, but you don't have the same flexibility as with Skin Studio.
Skin Studio may look a bit daunting at first, but a couple of days and a lot of Google allows to learn to use it, and then it's very powerful.
Mixing styles is also a very powerful feature. If you really want a W7 or XP look & feel, the Win Retro taskbar is perfect, while for the rest, Precision (with some mods to make the date, size, etc... fields of the explorer more visible instead of being white and very hard to see) is quite nice.
The whole Win Retro Style is (my taste only) pretty ugly, to dark and too much contrast.
Are links allowed here? If yes, and if somebody is interested, I could post a link to the whole modified Precision and Win Retro directories with my mods. Just in case somebody is *exactly* as nutter about these details as me.
Forget Corporate, it's incompatible with too many programs.