Problem with creating a window with scroll bar

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C++

Win32

MFC

Hi ,

i have problem with creating a window with scroll bar, here i am creating child window with scrollbar's but the problem is scrollbar's are in disabling state. is there any way can we able to create a scroll bars to a childwindow.
We are in document management system so we need to show files(PDF) in viewer by creating child windows , so the child window is creating the problem.
Finally I want solution in Win32.

What I have tried:

CreateWindowEx(0L,L"static",NULL,WS_CHILD| WS_VISIBLE | WS_CLIPSIBLINGS | WS_VSCROLL | WS_HSCROLL ,0,0,0,0,(HWND)pDataSurface,0,(HINSTANCE)GetWindowLong((HWND)pDataSurface,GWL_USERDATA),0);