在MFC对话框中，如何让控件Static和Radio和CheckBox背景透明？

from:

http://blog.youkuaiyun.com/zhoujielunzhimi/article/details/8111120

HBRUSH CCTIClientDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr=CDialog::OnCtlColor(pDC,pWnd,nCtlColor);

int iID = pWnd->GetDlgCtrlID();
if(IDC_CHECK_AUTOLOGIN == iID || IDC_CHECK_PASSWD == iID || IDC_STATIC_PASSWD == iID || IDC_STATIC_REGIST == iID || IDC_STATIC_ASSIST == iID)     
{     
pDC->SetBkMode(TRANSPARENT);
CRect rc;
pWnd->GetWindowRect(&rc);
ScreenToClient(&rc);
CDC* dc = GetDC();
pDC->BitBlt(0,0,rc.Width(),rc.Height(),dc,rc.left,rc.top,SRCCOPY); //把父窗口背景图片先画到按钮上
ReleaseDC(dc);
hbr = (HBRUSH) ::GetStockObject(NULL_BRUSH);   
} 
return hbr;
}