Rich Edit and WM_PRINT

I have a rich edit control and I want to add some kind of a selection bar on the left side of it. I need to paint this bar on my own (gray background, images etc.).

The problem is that the rich edit control doesn't seem to handle the WM_PRINT / WM_PRINTCLIENT messages properly. I tried to override the OnPaint function, render the control to a bitmap in memory and paint the bar:

Code:

---

CMyRichEditCtrl::OnPaint()
{
  CPaintDC dc(this);
       
  CRect rcClient;
  GetClientRect(&rcClient);

  CDC dcMem;
  dcMem.CreateCompatibleDC(&dc);

  CBitmap bmpMem;
  bmpMem.CreateCompatibleBitmap(&dc, rcClient.Width(), rcClient.Height());

  dcMem.SelectObject(&bmpMem);

  SendMessage(WM_PRINT, (WPARAM)dcMem.m_hDC, PRF_CLIENT | PRF_ERASEBKGND);

  rcClient.right = 16;

  dcMem.FillSolidRect(&rcClient, RGB(192,192,192));

  dc.BitBlt(0, 0, rcClient.Width(), rcClient.Height(), &dcMem, 0, 0, SRCCOPY);
}

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It doesn't work (I tried with riched v1 and v2). Does anyone have an idea how to do this?

look @ RedrawWindow