这种方法只适用于下面这些控件

• CTLCOLOR_BTN   Button control
• CTLCOLOR_DLG   Dialog box
• CTLCOLOR_EDIT   Edit control
• CTLCOLOR_LISTBOX   List-box control
• CTLCOLOR_MSGBOX   Message box
• CTLCOLOR_SCROLLBAR   Scroll-bar control
• CTLCOLOR_STATIC   Static control

• // 1. 在对话框的头文件中加入
  afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
  
  // 2. 在对话框的cpp文件中加入
  BEGIN_MESSAGE_MAP(CtransparentDlg, CDialog)
      ON_WM_CTLCOLOR()
      //}}AFX_MSG_MAP
  END_MESSAGE_MAP()
  
  HBRUSH CtransparentDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
  {
      HBRUSH   hBrush   =   CDialog::OnCtlColor(pDC,   pWnd,   nCtlColor);   
  
      if(nCtlColor == CTLCOLOR_STATIC)
      {
          pDC->SetBkMode(TRANSPARENT);   
          return   (HBRUSH)::GetStockObject(NULL_BRUSH);   
      }
      return hBrush;
  }