{
    INT scrollRange = 0;

    if (infoPtr->hwndChild)
    {
        INT wndSize, childSize;
        RECT wndRect;
        GetWindowRect(infoPtr->hwndSelf, &wndRect);

        if (infoPtr->dwStyle & PGS_HORZ)
        {
            wndSize = wndRect.right - wndRect.left;
            PAGER_CalcSize(infoPtr, &infoPtr->nWidth, TRUE);
            childSize = infoPtr->nWidth;
        }
        else
        {
            wndSize = wndRect.bottom - wndRect.top;
            PAGER_CalcSize(infoPtr, &infoPtr->nHeight, FALSE);
            childSize = infoPtr->nHeight;
        }

        TRACE("childSize = %d,  wndSize = %d\n", childSize, wndSize);
        if (childSize > wndSize)
            scrollRange = childSize - wndSize + infoPtr->nButtonSize;
    }

    TRACE("[%p] returns %d\n", infoPtr->hwndSelf, scrollRange);
    return scrollRange;
}

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