Which, if any, achieves Windows native look: GTK+, wxWidgets, Qt, FLTK?

Question

I need to write an application that will be visually indistinguishable from something written natively for Windows XP/Vista/7 using whatever comes by default wi

Answer 1

Implementation details aside, wxWidgets philosophy is, and has always been, to look as natively as possible. We, wxWidgets developers, don't always achieve the goal of looking indistinguishably from the native applications but we always strive to do it and. AFAIK this is not such an important goal for Qt and definitely not for GTK+, so in my (obviously biased) opinion, wxWidgets is your best choice if you are serious about providing the best experience for your users, especially under OS X.

To answer your question more precisely, everything you list above is implemented using native controls in wxWidgets for Windows (rich text control is not available natively under the other platforms though).