function sortDataGrid()
    {
        var nodes = dataGrid.children.slice();
        var sortColumnIdentifier = dataGrid.sortColumnIdentifier;
        var sortDirection = dataGrid.sortOrder === "ascending" ? 1 : -1;
        var columnIsNumeric = true;

        for (var i = 0; i < nodes.length; i++) {
            if (isNaN(Number(nodes[i].data[sortColumnIdentifier])))
                columnIsNumeric = false;
        }

        function comparator(dataGridNode1, dataGridNode2)
        {
            var item1 = dataGridNode1.data[sortColumnIdentifier];
            var item2 = dataGridNode2.data[sortColumnIdentifier];

            var comparison;
            if (columnIsNumeric) {
                // Sort numbers based on comparing their values rather than a lexicographical comparison.
                var number1 = parseFloat(item1);
                var number2 = parseFloat(item2);
                comparison = number1 < number2 ? -1 : (number1 > number2 ? 1 : 0);
            } else
                comparison = item1 < item2 ? -1 : (item1 > item2 ? 1 : 0);

            return sortDirection * comparison;
        }

        nodes.sort(comparator);
        dataGrid.removeChildren();
        for (var i = 0; i < nodes.length; i++)
            dataGrid.appendChild(nodes[i]);
    }
@param {Array.<string>} columnNames
@param {Array.<string>} values