Dmitry Davidoff started implementation of
Windows XP Themes support.
Idea is to render all primitives using underlying OS
theme engine but still in windowless manner as it is
proven to work faster on feature reach UIs.

So currently main branch of Harmonia is unstable.
Last stable build is #40.
The plan is to implement system themes support and
make a stable branch on dsource.

FYI: Here is a Bjarke Viksoe attempt
to implement windowless framework in WTL style for
C++ : http://www.viksoe.dk/code/windowless1.htm

Andrew.