igGrid column hiding in multi column header

by georgianastasov

HTML

<script src="https://igniteui.com/js/modernizr.min.js"></script>
<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.10.3/jquery-ui.min.js"></script>
<script src="https://cdn-na.infragistics.com/igniteui/latest/js/infragistics.core.js"></script>
<script src="https://cdn-na.infragistics.com/igniteui/latest/js/infragistics.lob.js"></script>
<script src="https://igniteui.com/js-data/nw-customers"></script>
<link href="https://cdn-na.infragistics.com/igniteui/latest/css/themes/infragistics/infragistics.theme.css" rel="stylesheet"></link>
<link href="https://cdn-na.infragistics.com/igniteui/latest/css/structure/infragistics.css" rel="stylesheet"></link>

<table id="grid"></table>
<br />
<input type="button" id="hideButton" value="Hide Contact Title Column" />

JavaScript

$(function () {
            $("#grid").igGrid({
                width: "100%",
                height: "500px",
                autoGenerateColumns: false,
                dataSource: nwCustomers,
                responseDataKey: "results",
                columns: [
                    { headerText: "Customer ID", key: "CustomerID", dataType: "string", width: "100px" },
                    {
                        headerText: "Company Information",
                        group: [
                            { headerText: "Company Name", key: "CompanyName", dataType: "string", width: "150px" },
                            { headerText: "Contact Name", key: "ContactName", dataType: "string", width: "150px" },
                            { headerText: "Contact Title", key: "ContactTitle", dataType: "string", width: "150px" }
                        ]
                    },
                    {
                        headerText: "Address Information",
                        group: [
                        {
                            headerText: "Local Address",
                            group: [
                                { headerText: "Address", key: "Address", dataType: "string", width: "150px" },
                                { headerText: "City", key: "City", dataType: "string", width: "100px" }
                            ]
                        },
                            { headerText: "Postal Code", key: "PostalCode", dataType: "string", width: "100px" }
                        ]
                    },
                    {
                        headerText: "Phone Information",
                        group: [
                            { headerText: "Phone", key: "Phone", dataType: "string", width: "150px" },
                            { headerText: "Fax", key: "Fax", dataType: "string", width: "150px" }
                        ]
                    }
                ],
                features: [
                    {
             ...