Kendo MVVM

HTML

<script src="http://cdn.kendostatic.com/2013.3.1324/js/kendo.all.min.js"></script>
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.3.1324/styles/kendo.mobile.all.min.css">
<div data-role="view" id="testForm">  
    <h3 data-bind="text: label; visible: 0">XX</h3>
    <h3 data-bind="text: isLoggedInVM1()">yyy</h3>
    <h3 data-bind="visible: xx">
    zzz
    </h3>
</div>

JavaScript

var app = new kendo.mobile.Application();   

var userStateviewModel = kendo.observable({
    isLoggedIn: false,
});

var viewModel1 = kendo.observable({
    label: 'From ViewModel1',
    xx: 0,
    yy: 'ABC',
    isLoggedInVM1: function() {
        return userStateviewModel.get("isLoggedIn");
    }
});

userStateviewModel.set('isLoggedIn', true);
//viewModel1.set('isLoggedInVM1', userStateviewModel.isLoggedIn);

alert(viewModel1.isLoggedInVM1());

kendo.bind($("#testForm"), viewModel1);