InitCommonControlsEx is not necessary in win7?

[aj3423]

Hi,
I'm using win7 32bit + vs 2012, I found InitCommonControlsEx is not necessary when using common controls like progressbar.
step to reproduce:
1. create a win32 helloworld
2. in the WndProc, create a progressbar with
CreateWindow("msctls_progress32", "", WS_CHILD | WS_VISIBLE, 20, 20, 100, 20, hWnd, 0, 0, 0);

Any documentation about this?