void CWnd::MoveWindow(int x, int y, int nWidth, int nHeight, BOOL bRepaint)
{
	ASSERT(::IsWindow(m_hWnd));

	if (m_pCtrlSite == NULL)
		::MoveWindow(m_hWnd, x, y, nWidth, nHeight, bRepaint);
	else
		m_pCtrlSite->MoveWindow(x, y, nWidth, nHeight, bRepaint);
}

где
	COleControlSite* m_pCtrlSite;       // for wrapping an OLE control

void COleControlSite::MoveWindow(int x, int y, int nWidth, int nHeight, BOOL)
{
	ASSERT(m_pInPlaceObject != NULL);
	ASSERT(m_pObject != NULL);

	CRect rectOld(m_rect);
	m_rect.SetRect(x, y, x + nWidth, y + nHeight);
	if (SetExtent())
	{
		m_rect.SetRect(x, y, x + m_rect.Width(), y + m_rect.Height());
		m_pInPlaceObject->SetObjectRects(m_rect, m_rect);
	}
	else
	{
		m_rect = rectOld;
	}
}

BOOL COleControlSite::SetExtent()
{
	CSize size(m_rect.Size());
	CClientDC dc(NULL);
	dc.DPtoHIMETRIC(&size);

	HRESULT hr;

	if (SUCCEEDED(hr = m_pObject->SetExtent(DVASPECT_CONTENT, (SIZEL*)&size)))
	{
		if (SUCCEEDED(m_pObject->GetExtent(DVASPECT_CONTENT, (SIZEL*)&size)))
		{
			dc.HIMETRICtoDP(&size);
			m_rect.right = m_rect.left + size.cx;
			m_rect.bottom = m_rect.top + size.cy;
		}
	}

	return SUCCEEDED(hr);
}