Creating custom window GUI

So I've looked all over google and everywhere I could think of, and found nothing that could help me with this. Basically, I want to create a window, but with a custom theme and buttons, controls, etc, such as this one:

http://img199.imageshack.us/img199/2601/image1eal.png

The problem is, I don't know how to do that. I've looked for books that would help teach me this but I found nothing. How would I go about this? Someone told me I'd have to do this during the WM_NCPAINT event, but that's about as much as I know on this.

A book or a tutorial link of some sort would help a lot. Thanks

That app is a WPF app coded with C# or VB.Net.

A good place to start to code with WPF is the msdn samples:

http://msdn.microsoft.com/en-us/library/ms771633.aspx

What is relatively easy to code WPF would be a pain in Win32.