How to change background color for MFC?

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I'm trying to change the background color for the dialog in my MFC project, but nothing seems to be working. So far I have:

1) Added "CBrush m_brush" to the header public.

2) Added "m_brush.CreateSolidBrush(RGB(255, 0, 0))" on init.

3) Added OnCtlColor in Dlg.cpp.

HBRUSH CScheduleDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) {
HBRUSH hbr = CDialogEx::OnCtlColor(pDC, pWnd, nCtlColor);
hbr = m_brush;

return hbr;
}

(As well as "afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)" to the header protected)

The code runs, but the color is still blank. Is there anything else I can do?

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