A good GUI API

[LoLFactor]

I've read theForger's tutorial on winprog.org, but the WIN32 API is minimalist and you cannot use it to create widgets, buttons and such others. So, as a result, I'm asking you: Do you know any well documented and user-friendly(I don't have to compile it myself, say) GUI API?

[Bazzy]

You do can use Win API to create buttons or all other controls
eg:
HWND aButton = CreateWindow("Button", ... );

read: http://msdn.microsoft.com/en-us/library/bb773173(VS.85).aspx

In Win API you can also have common dialog such as save file without building it with all the controls.

At MSDN you can find documentation on Win 32, if you have more doubts ask here more information