C / C++ / MFC

LRESULT OnNCActivate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
        //Perform your custom activation here.
 
        //This is the key to prevent the caption from being painted 
        //by the system
	::SetWindowLong(m_hWnd, DWL_MSGRESULT, FALSE);
	return TRUE;
}

LRESULT OnNCPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
        //You should call the defDlgProc for here.

        //Preform your custom caption painting here.

return TRUE;
}

LRESULT CAnothertestDlg::OnNCPaint(WPARAM wParam, LPARAM lParam)
{
	::SetWindowLong(m_hWnd, DWL_MSGRESULT, FALSE);
	return TRUE;
}

LRESULT CAnothertestDlg::OnNCActivate(WPARAM wParam, LPARAM lParam)
{
	return TRUE;
}

LRESULT CAnothertestDlg::OnNCPaint(WPARAM wParam, LPARAM lParam)
{
	return TRUE;
}

LRESULT CAnothertestDlg::OnNCActivate(WPARAM wParam, LPARAM lParam)
{
	::SetWindowLong(m_hWnd, DWL_MSGRESULT, FALSE);
	return TRUE;
}

void CMyControl::OnDraw(CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid)
{
        // m_ctrlDictSel is my child control (could be two of them)
	if (m_ctrlDictSel.GetSafeHwnd())
	{
                // Here we resize the child controls if the ActiveX control
                // size has changed, otherwise, just redraw the child wnds.
                //
		if (m_tRect != rcBounds)
		{
			m_ctrlDictSel.MoveWindow(rcBounds, TRUE);
			m_tRect = rcBounds;
		}
		else
		{
			m_ctrlDictSel.Invalidate(TRUE);
		}
	}
	else
	{
                // Design mode, draw a crossed box.
                //
		pdc->FillRect(rcBounds, CBrush::FromHandle((HBRUSH)GetStockObject(WHITE_BRUSH)));
		pdc->Rectangle(rcBounds);
		pdc->MoveTo(rcBounds.left, rcBounds.top);
		pdc->LineTo(rcBounds.right, rcBounds.bottom);
		pdc->MoveTo(rcBounds.right, rcBounds.top);
		pdc->LineTo(rcBounds.left, rcBounds.bottom);
	}
}