virtual bool page_down();
    virtual bool line_down();
    virtual bool page_up();
    virtual bool line_up();

// Don't scroll past MEL_TITLE entries
bool formatted_scroller::page_down()
{
    const int old_first = first_entry;
    if ( (int)items.size() <= first_entry + pagesize )
        return false;

    // If, when scrolling forward, we encounter a MEL_TITLE
    // somewhere in the newly displayed page, stop scrolling
    // just before it becomes visible
    int target;
    for (target = first_entry; target < first_entry + pagesize; ++target )
    {
        const int offset = target + pagesize - 1;
        if (offset < (int)items.size() && items[offset]->level == MEL_TITLE)
            break;
    }
    first_entry = target;
    return (old_first != first_entry);
}
bool formatted_scroller::page_up()
{
    int old_first = first_entry;
    // If, when scrolling backward, we encounter a MEL_TITLE
    // somewhere in the newly displayed page, stop scrolling
    // just before it becomes visible
    for ( int i = 0; i < pagesize; ++i )
    {
        if (first_entry == 0 || items[first_entry-1]->level == MEL_TITLE)
            break;
        --first_entry;
    }
    return (old_first != first_entry);
}
bool formatted_scroller::line_down()
{
    if (first_entry + pagesize < (int) items.size() &&
        items[first_entry + pagesize]->level != MEL_TITLE )
    {
        ++first_entry;
        return true;
    }
    return false;
}
bool formatted_scroller::line_up()
{
    if (first_entry > 0 && items[first_entry-1]->level != MEL_TITLE)
    {
        --first_entry;
        return true;
    }
    return false;
}

    // bracket with MEL_TITLES, so that you won't scroll
    // into it or above it
    m.add_entry(new MenuEntry(std::string(), MEL_TITLE));
    for ( int i = 0; i < get_number_of_lines(); ++i )
        m.add_entry(new MenuEntry(std::string()));
    m.add_entry(new MenuEntry(std::string(), MEL_TITLE));