void beginRender(MarkupWriter writer) 
{
        int availableRows = source.getAvailableRows();
        maxPages = ((availableRows - 1) / rowsPerPage) + 1;
        if (maxPages <  2) return;
        writer.element("div", "class", "t-data-grid-pager");
        lastIndex = 0;
        for (int i = 1; i < = 2; i++)
            writePageLink(writer, i);
        int low = currentPage - range;
        int high = currentPage + range;
        if (low <  1)
        {
            low = 1;
            high = 2 * range + 1;
        }
        else
        {
            if (high  > maxPages)
            {
                high = maxPages;
                low = high - 2 * range;
            }
        }
        for (int i = low; i < = high; i++)
            writePageLink(writer, i);
        for (int i = maxPages - 1; i < = maxPages; i++)
            writePageLink(writer, i);
        writer.end();
}

  void onAction(int newPage) 
{
        // TODO: Validate newPage in range
        currentPage = newPage;
}

Normal, non-Ajax event handler.

 boolean onAction(int newPage,
    String zone) 
{
        onAction(newPage);
        resources.triggerEvent(InternalConstants.GRID_INPLACE_UPDATE, new Object[] {zone}, null);
        return true; // abort event
}

Akjax event handler, passing the zone along.