Some question about TabbedView_vc60

In the sample project TabbedView_vc60, I have some question about

the following code:

void CTabbedViewView::OnTimer(UINT nIDEvent)
{
    if (m_nIDEvent == nIDEvent)
    {
        CPoint point;
        ::GetCursorPos(&point);
        ScreenToClient(&point);

        if (m_point == point)
        {
             CTabCtrl& tabCtrl = GetTabCtrl();

             CRect rcItem;
             int iItem;
            for (iItem = 0; iItem < tabCtrl.GetItemCount(); ++iItem )
             {
                 tabCtrl.GetItemRect(iItem, &rcItem);

                 if (rcItem.PtInRect(m_point) && tabCtrl.GetCurSel() != iItem)
                 {
                     SetActiveView(iItem);
                     break;
                 }
             }
        }
       
        KillTimer(m_nIDEvent);
    }
    else
    {
        CXTTabView::OnTimer(nIDEvent);
    }
}

void CTabbedViewView::OnMouseMove(UINT nFlags, CPoint point)
{
 CXTTabView::OnMouseMove(nFlags, point);

    m_point = point;
    SetTimer(m_nIDEvent, 2500, NULL);   
}

I try to debug it , but i really can not find the case the condition

" if (m_point == point) " to be true. I don't understand what the function

of code in this branch is . Can someone help me ,Thank U !