组合框在下移类型时，编辑框的背景色如何改变

HBRUSH CTEST_LISTCTRLDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
    HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
    if (nCtlColor == CTLCOLOR_EDIT)
    {
        pDC->SetBkColor(RGB(255,5,0));
    }
    
    return hbr;
}