RichEdit color problem

Hello.

I would like to add message (insert at the end) to my RichEdit control. But each one can have a different color. Moreover, I want that scroll bar follow the last inserted line :

Here is what I have code yet :

Code:

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void SendMessageToViewer(const CString & msg, const COLORREF & crNewColor)
{
  long iTotalTextLength = m_Rec_Viewer.GetTextLength();
  m_Rec_Viewer.SetSel( -1, -1);
  m_Rec_Viewer.ReplaceSel( msg );
  long iStartPos = iTotalTextLength;

  CHARFORMAT cf;
  cf.cbSize = sizeof(CHARFORMAT);
  cf.dwMask = CFM_COLOR | CFM_UNDERLINE | CFM_BOLD;
  cf.dwEffects = (unsigned long)~( CFE_AUTOCOLOR | CFE_UNDERLINE | CFE_BOLD);
  cf.crTextColor = crNewColor;

  long iEndPos = m_Rec_Viewer.GetTextLength();
  m_Rec_Viewer.SetSel(iStartPos, iEndPos);
  m_Rec_Viewer.SetSelectionCharFormat(cf);
  m_Rec_Viewer.HideSelection(TRUE, FALSE);
  m_Rec_Viewer.LineScroll( this->m_SequencerDialog->m_Rec_Viewer.GetLineCount() - 1 );
  m_Rec_Viewer.UpdateWindow();
}

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All works, except that color is applied to my text but not starting at the first letter after inserting 2, 3, 4, 5 lines.... Also, my scrollbar is not following well my text.

PS : Sorry for my poor english :(

Thank for you support.