how to set a windowPlayer for MCI device

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C++

UI

audio-video

I use mciSend command to set a window for my movie open by mcisendcommand:

MCI_DGV_WINDOW_PARMS mciWindow;
mciWindow.hWnd = hWnd;
mciSendCommand(mciDevId, MCI_WINDOW,MCI_DGV_WINDOW_HWND, (DWORD)(LPSTR)&mciWindow);

hWnd is a handle of window is created:

HWND hWnd =  CreateWindow(_T("BUTTON"),_T(""), WS_CHILD | WS_VISIBLE | SS_CENTER, 10, 10, rect.right/2,rect.bottom -130, hParent, NULL, hInstance, NULL);

but my movie is open with its default size, bigger than window hWnd. how i can set it as large as hWnd.
Thanks for help!