How to customize the jsGrid new row position

How to customize the position of new row in jsGrid. When click on the "+" icon To appear the new row at the end of the table.

New row in jsGrid:

_createInsertRow: function() {
        if($.isFunction(this.insertRowRenderer))
            return $(this.renderTemplate(this.insertRowRenderer, this));

        var $result = $("<tr>").addClass(this.insertRowClass);

        this._eachField(function(field) {
            this._prepareCell("<td>", field, "insertcss")
                .append(this.renderTemplate(field.insertTemplate, field))
                .appendTo($result);
        });

        return $result;
    },