CListCtrl did not show text immediately like StaticText

I have a code like this to write install log to a static text and a list control, and i have a button to start the installer that be handle by function OnClickInstallBtn() but every time I call the WriteLogtoScreen(), only the static text change and nothing show up in the list until the OnClickInstallBtn() is done and everything on that list show up all at one.

How can i make it show up right away like the static text?

WriteLogtoScreen(LPCTSTR sLog)
{
    int         iItems;
    iItems = m_ListLog.GetItemCount();

    m_ListLog.InsertItem(iItems, sLog);
    m_ListLog.Update(iItems);
    m_ListLog.SetItemText(iItems, 0, sLog);
    m_ListLog.Update(iItems);
    UpdateData(FALSE);

    SetDlgItemText(IDC_STATIC, sLog);
}

You should call RedrawWindow() if you want to force the redraw of your list explicitly in something like this :

    void WriteLogtoScreen(LPCTSTR sLog)  
    {
            int      iItems;
            iItems = m_ListLog.GetItemCount();

            m_ListLog.InsertItem(iItems, sLog);
            m_ListLog.Update(iItems);
            m_ListLog.SetItemText(iItems, 0, sLog);
            m_ListLog.Update(iItems);
            UpdateData(FALSE);

            //instant redraw  
            m_ListLog.RedrawWindow();

            SetDlgItemText(IDC_STATIC, sLog);  
    }