CNoFlickerWnd error

public:
    CNoFlickerWnd<CSomeWnd>  m_wndSomeVar;

protected:
    virtual LRESULT CMyView::WindowProc(UINT message,WPARAM wParam,LPARAM lParam);

LRESULT CMyView::WindowProc(UINT message,WPARAM wParam,LPARAM lParam)
{
    switch (message)
    {
        case WM_PAINT:
        {
            CPaintDC dc(this);

            // Get the client rect, and paint to a memory device context.
            // This will help reduce screen flicker. Pass the memory
            // device context to the default window procedure to do
            // default painting.
            CXTPClientRect rc(this);
            CXTPBufferDC memDC(dc, rc);
            memDC.FillSolidRect(rc, GetXtremeColor(COLOR_WINDOW));

            return CFormView::DefWindowProc(WM_PAINT,(WPARAM)
                memDC.m_hDC, 0);
        }
        case WM_ERASEBKGND:
            return TRUE;
    }
    return CFormView::WindowProc(message, wParam, lParam);
}