hello I did this sample
http://www.jqwidgets.com/jquery-widgets-demo/demos/jqxgrid/index.htm#demos/jqxgrid/nestedgrids.htm
But the line does not appear
What is the problem? thank you

// nested grid
var nestedDataAdapter = new $.jqx.dataAdapter(nestedSource);
if (grid != null) {
grid.jqxGrid({
source: nestedDataAdapter, editmode: 'selectedrow', selectionmode: 'singlerow', enabletooltips: true, editable: true, width: '98%', height: 200 ,
columns: [
],
});
}
}
// master grid
$("#Gd_ExpensesGrid").jqxGrid(
{
width: '98%',
source: dataAdapter,
pageable: true,
sortable: true,
altrows: true,
height: '500px',
theme: 'arctic',
initrowdetails: initrowdetails,
virtualmode: false,
rowdetailstemplate: { rowdetails: "<div id='grid'></div>", rowdetailsheight: 350, rowdetailshidden: true },
rowdetails: true,
editable: false,
columns: window.Gd_ExpensesGrid.columns,
showtoolbar: true,
},
});