Pausing notifications in KnockoutJS

http://www.knockmeout.net/2011/04/pausing-notifications-in-knockoutjs.html

HTML

<script src="http://rniemeyer.github.com/KnockMeOut/Scripts/jquery.tmpl.js"></script>
<script src="http://rniemeyer.github.com/KnockMeOut/Scripts/knockout-latest.debug.js"></script>
<div id="customersArea" data-bind="foreach: people">
            <div class="section" data-bind="attr: { 'personid': PersonId }" >
                <div class="sectionActions">
                    <div><a class="action" href="#" data-bind='click: $parent.removePerson'>Remove</a></div>
                </div>
                <div class="sectionText">
                    <span data-bind="text:LastName"></span>
                    <span data-bind="text:FirstName"></span>
                    <span data-bind="if:MailingAddress">
                        <span data-bind="with:MailingAddress">
                            <span data-bind="text:StreetPartOne"> </span>
                            <span data-bind="text:StreetPartTwo">  </span>
                            <span data-bind="text:City"></span>
                            <span data-bind="text:PostalCode"></span>
                        </span>
                    </span>

                    <span data-bind="if:EmailAddress, text:EmailAddress"></span>
                    <span data-bind="if:MainPhoneNumber, text:MainPhoneNumber"></span>
                    <span data-bind="if:MobilePhoneNumber, text:MobilePhoneNumber"></span>

                </div>

                <div class="sectionOptions">

                </div>
            </div>
        </div>

JavaScript

function User(id, name) {
    this.id = ko.observable(id);
    this.name = ko.observable(name);
    this.isActive = ko.observable(false);
}

var viewModel = {
    people: ko.observableArray(),
    add: function(person) {
       this.people.push(person);
    }
};


ko.applyBindings(viewModel , $("#customersArea")[0]);
try{viewModel.add({PersonId:33});}
catch(e){alert(e);}
try{viewModel.add({PersonId:44});}
catch(e){alert(e);}