Newbie needs help with SkinStudio 10, WindowBlinds 10

I'm blundering around in SkinStudio 10, started with changing system colors. My main interest is in reducing the incidence of glaring white backgrounds in windows, dialogs, etc.

My go-to test subject is File Explorer. I have succeeded in reducing its background whiteness to a soft gray/green, but I see that the title bar failed to pick up the color I assigned that item, and the menu bar retains what looks like a default aero-style blue. The bottom bar picks up the color I assigned to backgrounds; is that not skinnable? And I can't even see what I've selected for "selected text", for example, if I try to change the name of a file listed. In fact, the selection highlight doesn't even move to the item I select, when I select a different line! What am I doing wrong?