advanced datatables CodeIgniter

I'm breaking my head with a little something in CodeIgniter, I need to create an advanced table that extends details about each table item, as you can see in the code below I can not separate a detail line for table item, att;

<div class="col-md-offset-2">
<div class="col-md-10">
    <? //
    $tmpl = array(
        'table_open' => '<table class="table table-striped table-bordered table-hover" id="tabela_poas">',
        'heading_row_start' => '<tr>',
        'heading_row_end' => '</tr>',
        'heading_cell_start' => '<th>',
        'heading_cell_end' => '</th>',

        'row_start' => '<tr data-toggle="collapse" data-target="#demo1">',
        'row_end' => '</tr>',
        'cell_start' => '<td align="center" role="row">',
        'cell_end' => '</td>',

        'row_alt_start' => '<tr>',
        'row_alt_end' => '</tr>',
        'cell_alt_start' => '<td align="center">',
        'cell_alt_end' => '</td>',

        'table_close' => '</table>'
    );

    //        ?>
    <script>
        $(document).ready(function () {
            //                TableAdvanced.init('tabela_poas');
            //                iniciar_tabela('tabela_poas');
            Init_mascaras_jquery();
            TableAdvanced.init('tabela_poas');
        });

        //            jQuery(document).ready(function () {
        //                Metronic.init(); // init metronic core components
        //                Layout.init(); // init current layout
        //                Demo.init(); // init demo features
        //
        //            });

    </script>
    <input type="hidden" id="idquadro" value="<? // echo @$quadro_por_id[0]->IDQUADRO; ?>">

    <div class="row">
        <div class="col-md-12">
            <? //

            $detalhes = '

                    <div class="accordian-body collapse" id="demo1">
                        <table class="table table-striped table-bordered table-hover">
                            <thead>

                            <tr>
                                <th>Access Key</th>
                                <th>Secret Key</th>
                                <th>Status</th>
                                <th> Created</th>
                                <th> Expires</th>

                            </tr>
                            </thead>
                            <tbody >
                           <td class="details" colspan="5">
                           </td>

                           </tr>

                            </tbody>
                        </table>

                    </div>

           ';

            if (isset($dados_produtos[0])) {
                foreach ($dados_produtos as $row) {
                    $cell = array('data' => $detalhes, 'class' => 'highlight', 'colspan' => 7);
                    $this->table->set_template($tmpl);
                    $this->table->set_heading('IdItem', 'Modalidade', 'Área', 'Titulo', 'Beneficiário', 'Valor Aprovado', 'Detalhes');
                    $this->table->add_row(

                        @$row->idpoaitem,
                        @$row->modalidade,
                        @$row->area,
                        @$row->titulo,
                        @$row->beneficiario,
                        @$row->valoraprovado,
                        '  <button class="btn btn-default btn-xs"><span class="glyphicon glyphicon-eye-open"></span>
                    </button>'
                    );

                    $this->table->add_row($cell);
                }
            }
            ?>
        </div>
    </div>
    <? echo $this->table->generate() . '<br><br>'; ?>
</div>