How to insert a thick Line into RichEditCtrl??

Hi,

I am inserting a line into RichEditCtrl using AppendToLog() function(The defination of this function is attached as Code Snippet).......I am Calling this function as AppendToLog("______________________________________________________",RGB(24,233,170));
This call will insert a line into RichEditctrl(Which is not Thick),But i need this line to be inserted as a Very Thick Line..How can i solve this problem???

int CEncopyDlg::AppendToLog(CString str,COLORREF linecolor)
{
  int nOldLines = 0, nNewLines = 0, nScroll = 0;
  long nInsertionPoint = 0;
  CHARFORMAT cf;
  // Save number of lines before insertion of new text
  nOldLines = m_ctrlLog.GetLineCount();
  // Initialize character format structure
  cf.cbSize = sizeof(CHARFORMAT);
  cf.dwMask = CFM_COLOR;
  cf.dwEffects = 0; // To disable CFE_AUTOCOLOR
  cf.crTextColor = linecolor;
  // Set insertion point to end of text
  nInsertionPoint = m_ctrlLog.GetWindowTextLength();
  m_ctrlLog.SetSel(nInsertionPoint, -1);
  // Set the character format
  m_ctrlLog.SetSelectionCharFormat(cf);
  // Replace selection. Because we have nothing 
  // selected, this will simply insert
  // the string at the current caret position.
  m_ctrlLog.ReplaceSel(str);
  // Get new line count
  nNewLines = m_ctrlLog.GetLineCount();
  // Scroll by the number of lines just inserted
  nScroll = nNewLines - nOldLines;
  m_ctrlLog.LineScroll(nScroll);
  return 0;
}

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