Sigh. That's the titlebar to your window, and LiteStep doesn't do anything to those. Never has. Probably never will.

LiteStep does not skin windows.

Look at windowblinds or a uxtheme patcher if you want to do that kind of stuff.

See also here:

http://www.litestep.net/index.php?section=4&action=view&catId=1&id=5665&hl=skin+windows