MDI ChildFrame Caption Redraw Problème (Office 2007 Thèmes)

	
// crée la fenêtre frame MDI principale
pMainFrame = new CMainFrame;
if (!pMainFrame || !pMainFrame->LoadFrame(IDR_MAINFRAME))
{
	delete pMainFrame;
	return FALSE;
}

m_pMainWnd = pMainFrame;

CMainFrame::CMainFrame()
{
	theApp.m_nAppLook = theApp.GetInt(_T("ApplicationLook"),            ID_VIEW_APPLOOK_VS_2008);

}

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
   if (CMDIFrameWndEx::OnCreate(lpCreateStruct) == -1)
   return -1;

   OnApplicationLook(theApp.m_nAppLook);

	

MainChild = new Child;

if (MainChild->Create("MDICLIENT",Network,
		WS_CHILD|WS_OVERLAPPEDWINDOW,
		CRect(0,0,800,400),((CMainFrame*)Parent))==0)
    return false;

LRESULT Child::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
	return CMDIChildWndEx::WindowProc(message, wParam, lParam);
}

void Child::OnNcPaint()
{
	// TODO: Add your message handler code here
	// Do not call CMDIChildWndEx::OnNcPaint() for painting messages
	CMDIChildWndEx::OnNcPaint();
	
	CWindowDC dc(this);
	CRect rect;
	GetWindowRect(rect);
	COLORREF c = GetPixel(dc,10,28);
        CRect r = CRect(10,30,rect.Width()-10,32);
	dc.FillSolidRect(r, c);
        ReleaseDC(&dc);
}

void Child::OnNcPaint()
{
	CMDIChildWndEx::OnNcPaint();	
        UpdateCaption();
}
BOOL Child::OnNcCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (!CMDIChildWndEx::OnNcCreate(lpCreateStruct))
		return FALSE;

        UpdateCaption();

	return TRUE;
}
void Child::UpdateCaption()
{
	CWindowDC dc(this);
	COLORREF c = GetPixel(dc,1,30);
	if (c!=CLR_INVALID)
	{
	 CRect rect;
	 GetWindowRect(rect);
         CRect r = CRect(10,30,rect.Width()-10,32);
         dc.FillSolidRect(r, GetPixel(dc,1,30));
	}
	ReleaseDC(&dc);
}