Maybe I knew this at one time but ......
From Raymond's "The Old New Thing".
http://blogs.msdn.com/b/oldnewthing/archive/2014/02/19/10501282.aspx
James
Wow! Makes me glad I'm not into fancy graphics! I'll stick to my number crunching any day!
The solution is to use a real graphic container control, or to write your own using the core CreateWindowEx :)