jQuery Grid Plugin - jqGrid

Hello, my grid stopped when i'm put the subGrid: true, he doesnt show the gridlines and dont hide the loading,  if a set false them he work again plz someone help m.

    function subGridExpand(subgrid_id, row_id) {
            var subgrid_table_id;
            var pager_id;
            subgrid_table_id = subgrid_id + "_t";
            pager_id = "p_" + subgrid_table_id;
            $("#" + subgrid_id).html("<table id='" + subgrid_table_id + "' class='scroll'></table><div id='" + pager_id + "' class='scroll'></div>");
            jQuery("#" + subgrid_table_id).jqGrid({
                url: "./WCF/EventoWCF.svc/SelectSubGrid?idrow=" + row_id,
                datatype: "json",
                colNames: ['Nome', 'Data Envio'],
                colModel: [
                { name: "NOME", index: "NOME", width: 80, key: true },
                { name: "DT_ENVIO_MALA", index: "DT_ENVIO_MALA", width: 130, sorttype: 'date', formatter: 'date', formatoptions: { srcformat: 'd-m-y', newformat: 'd/m/y' }, datefmt: 'd/m/y' }
                ],
                rowNum: 10,
                pager: pager_id,
                sortname: 'NOME',
                sortorder: "asc",
                height: '100%'
            }).navGrid("#" + pager_id, { edit: false, add: false, del: false });
            return true;
        }
        function subGridCollapse(subgrid_id, row_id) {
            var subgrid_table_id;
            subgrid_table_id = subgrid_id + "_t";
            jQuery("#" + subgrid_table_id).remove();
            return true;
        }
         $(document).ready(function() {
            gridJs = jQuery("#list").jqGrid({ url: "./WCF/EventoWCF.svc/Select",
                editurl: "./WCF/EventoWCF.svc/HandleOpp",
                datatype: "json",
                mtype: 'GET',
                colModel: [{ name: 'id', key: true, index: 'CodEvento', label: 'Codigo', hidden: true, hidedlg: true, width: 60, editable: false },
                            { name: 'NOME_EVENTO', index: 'NOME_EVENTO', label: 'Nome', width: 60, editable: true, editoptions: { size: 25, maxlength: 50} },
                            { name: 'DT_EVENTO', index: 'DT_EVENTO', label: 'Date', sorttype: 'date', formatter: 'date', formatoptions: { srcformat: 'd-m-y', newformat: 'd/m/y' }, datefmt: 'd/m/y', width: 60, editable: true, editoptions: { size: 25, maxlength: 50,
                                dataInit: function(elem) {
                                    $(elem).datepicker();
                                }
                            }, searchoptions: { dataInit: function(elem) {
                                $(elem).datepicker();
                            }
                            }
                            },
                            { name: 'DESC_EVENTO', index: 'DESC_EVENTO', label: 'Descrição', width: 60, editable: true, edittype: 'textarea', editoptions: { size: 20, cols: 40, maxlength: 50} },
                            { name: 'HR_INICIO', index: 'HR_INICIO', label: 'Inicio', width: 60, editable: true, editoptions: { size: 25, maxlength: 50} },
                            { name: 'HR_FIM', index: 'HR_FIM', label: 'Fim', width: 60, editable: true, editoptions: { size: 25, maxlength: 50}}],
                rowNum: 10,
                rowList: [10, 20, 30],
                pager: '#pager',
                jsonReader: {
                    root: "rows",
                    page: "page",
                    total: "total",
                    records: "records",
                    repeatitems: false,
                    cell: "cell",
                    id: "0"
                },
                sortname: 'NOME_EVENTO',
                viewrecords: true,
                autowidth: true,
                subGrid: true,
                imgpath: "CSS/redmond/images",
                gridview: true,
                multiselect: false,
                rownumbers: false,
                sortorder: "asc",
                height: "100%",
                viewsortcols: true,
                caption: "Evento",
                subGridRowExpanded: subGridExpand,
                subGridRowColapsed: subGridCollapse
            }).navGrid('#pager', { view: true },
         { height: 180, width: 340, reloadAfterSubmit: true, closeOnEscape: true }, //edit
         {height: 180, width: 340, reloadAfterSubmit: true, closeOnEscape: true }, //add
         {closeOnEscape: true, reloadAfterSubmit: true, closeOnEscape: true }, //del
         {multipleSearch: true, closeOnEscape: true }, //search
         {height: 180, closeOnEscape: true });      //view
            gridJs.filterToolbar({ autosearch: true });

        }