JSGrid Multiselect

HTML

<link rel="stylesheet" href="https://code.jquery.com/ui/1.10.4/themes/redmond/jquery-ui.css">
<script src="https://code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jsgrid/1.5.1/jsgrid.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jsgrid/1.5.1/jsgrid.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jsgrid/1.5.1/jsgrid-theme.css">
<div id="jsGrid"></div>

CSS

.jsgrid-cell1 { 
    overflow: hidden; 
}

.jsgrid-pager1 { text-align: center; }

JavaScript

var data = [
    {
        "Name": "Test Test",
        "TA": [1],
        "Married": false
    },
    {
        "Name": "Connor Johnston",
        "TA": [2],
        "Married": false
    },
    {
        "Name": "Lacey Hess",
        "TA": [1],
        "Married": false
    },
    {
        "Name": "Timothy Henson",
        "TA": [2],
        "Married": false
    }
];

var transitAgencies= [{
  ID: 1,
  TAName: "Test1"
}, {
  ID: 2,
  TAName: "Test2"
}];

var MultiselectField = function(config) {
    jsGrid.Field.call(this, config);
};

MultiselectField.prototype = new jsGrid.Field({
    
    items: [],
    textField: "",
    
    itemTemplate: function(value) {
        return $.makeArray(value).join(", ");
    },
    
    _createSelect: function(selected) {
        var textField = this.textField;
        var $result = $("<select>").prop("multiple", true);
        
        $.each(this.items, function(_, item) {
            var value = item[textField];
            var $opt = $("<option>").text(value);
            
            if($.inArray(value, selected) > -1) {
                $opt.attr("selected", "selected");
            }
            
            $result.append($opt);
        });
        
        return $result;
    },
    
    insertTemplate: function() {
        var insertControl = this._insertControl = this._createSelect();
        
        setTimeout(function() {
            //insertControl.multiselect({
            //   minWidth: 140
            //});
        });
        
        return insertControl;
    },
        
    insertValue: function() {
        return this._insertControl.find("option:selected").map(function() {    
            return this.selected ? $(this).text() : null;
        });
    }
});

jsGrid.fields.multiselect = MultiselectField;

$("#jsGrid").jsGrid({
        height: 300,
        width: "100%",
 
 				paging: true,
        autoload: true,
        inserting: true,
 
        pageSize: 2,
 
        controller: {
        	loadData:...