Title Bar Colour Gradient In Windows Classic?

My main consideration in choosing the appearance of my desktop and windows thereon is clarity, ease of reading any text, and distinguishing between windows at a glance, and also keeping performance to a maximum. To this end, having tried various Aero themes, although I did like the rounded corners of windows, for the sake of clarity I abandoned Aero for my own customized Windows Classic appearance. Not flashy but at least clearer for me than any of the other themes.When I installed Windows 7 I quickly reverted to Windows Classic, and chose for the active window title bar colours dark green as Color 1 and a lightish blue for Color 2 (with yellow text), so there was a gradient from green to blue along the title bar. I'm not bothered about whether anyone else likes that - it's served me well for the best combination of clarity and agreeableness through various Windows versions.

Yesterday I followed a tip from a magazine and ran the Windows 7 screen colour calibration facility. After I'd run that I noticed that all my active windows had just the dark green and no gradient. When I went into the Personalize facility to change that back, I found that Color 2 was greyed out, so that I could not set it again.I know this is a silly little point, but actually the gradient did make the active windows look less severe and 'blocky', and I'd like to restore my ability to set the second colour.Reverting to Aero is no option as far as I'm concerned, for to me multiple windows look to me extremely confusing in Aero, and some taskbar text is difficult to read, no matter what colour / lightness settings one uses.Somehow I doubt whether my calibrating the screen colours had anything to do with the little problem I've run into; I assume it must be just coincidence. I did, however, recently switch to manual a few supposedly non-essential services, and just possibly the change occurred then but I didn't notice it till after I'd done that screen colours calibration.