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   Hi,

There are no an easy setting for this, but you can do it in a custom way in 2 following steps:

1) Add a code to GetItemMetrics() method to draw a report cell underlined where a mouse currently placed. It could be like a following:

void CMessageRecord::GetItemMetrics(...)
{
...
    if (pView && pDrawArgs->pColumn && pDrawArgs->pControl && pDrawArgs->pColumn->GetIndex() == 5)
    {
        // Get the current mouse location and convert it to client coordinates.
        DWORD pos = GetMessagePos();
        CPoint ptCur(LOWORD(pos), HIWORD(pos));
        pDrawArgs->pControl->ScreenToClient(&ptCur);

        if (pDrawArgs->rcItem.PtInRect(ptCur))
        {
            static CFont m_fontUnderlined;

            if (!m_fontUnderlined.GetSafeHandle())
            {
                LOGFONT lf;
                 pDrawArgs->pControl->GetPaintManager()->m_fontText. GetLogFont(&lf);
                lf.lfUnderline = TRUE;

                m_fontUnderlined.CreateFontIndirect(&lf);
            }

            pItemMetrics->pFont = &m_fontUnderlined;
        }
    }
...

2) Add report control redrawing on mouse move inside a Report Control:

void CYourReport::OnReportMouseMove(...)
{
    GetReportCtrl().RedrawControl();
}

--
WBR,
Serge