CSliderCtrl Focus 테두리(점선) 없애는 방법

//.h 추가

CDC m_dcBg;
CBitmap m_bmpBg;
CBitmap *m_oldbmpBg;

 //.cpp 추가

//생성자 추가
m_dcBg.m_hDC = NULL;

//소멸자 추가
DeleteObject(m_dcBg.SelectObject(&m_oldbmpBg));
DeleteDC(m_dcBg);


 // CSliderCtrl 이벤트함수에 보면 NM_CUSTOMDRAW 메세지가 있다.
void ClassName::OnNMCustomdrawSlider1(NMHDR *pNMHDR, LRESULT *pResult)
{
 LPNMCUSTOMDRAW lpcd = (LPNMCUSTOMDRAW)pNMHDR;
 CDC *pDC = CDC::FromHandle(lpcd->hdc);
 switch(lpcd->dwDrawStage)
 {
 case CDDS_PREPAINT:
  *pResult = CDRF_NOTIFYITEMDRAW;
  break;
 case CDDS_ITEMPREPAINT:
  if (lpcd->dwItemSpec == TBCD_THUMB)
  {
   *pResult = CDRF_DODEFAULT;
   break;
  }
  if (lpcd->dwItemSpec == TBCD_CHANNEL)
  {
   CClientDC clientDC(GetParent());
   CRect crect;
   CRect wrect;
   GetClientRect(crect);
   GetWindowRect(wrect);
   GetParent()->ScreenToClient(wrect);
   if (m_dcBg.m_hDC == NULL)
   {
    m_dcBg.CreateCompatibleDC(&clientDC);
    m_bmpBg.CreateCompatibleBitmap(&clientDC, crect.Width(),
     crect.Height());
    m_oldbmpBg = m_dcBg.SelectObject(&m_bmpBg);
    m_dcBg.BitBlt(0, 0, crect.Width(), crect.Height(), &clientDC,

     wrect.left, wrect.top, SRCCOPY);
   }
   int iWidth = crect.Width();
   int iHeight = crect.Height();
   BitBlt(lpcd->hdc, 0, 0, iWidth, iHeight, m_dcBg.m_hDC, 0, 0, SRCCOPY);
   *pResult = 0;
   break;
  }
 }
}