Wijmo 5 - Simple validation

HTML

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
<script src="http://cdn.wijmo.com/5.20142.0/controls/wijmo.min.js"></script>
<script src="http://cdn.wijmo.com/5.20142.0/controls/wijmo.input.min.js"></script>
<script src="http://cdn.wijmo.com/5.20142.0/controls/wijmo.grid.min.js"></script>
<script src="http://cdn.wijmo.com/5.20142.0/controls/wijmo.chart.min.js"></script>
<link rel="stylesheet" href="http://cdn.wijmo.com/5.20142.0/styles/wijmo.min.css">
<script src="http://cdn.wijmo.com/5.20142.0/interop/angular/wijmo.angular.js"></script>
<!-- mark this as an Angular application and give it a controller -->
<div ng-app="app" ng-controller="appCtrl">
    
<h1>Simple validation</h1>

    <p>Able to enter alpha numeric in column 1 but not into column 2. Why is this?</p>
    <wj-flex-grid
        items-source="data">

</div>

JavaScript

// define app, include Wijmo 5 directives
var app = angular.module('app', ['wj']);

// controller
app.controller('appCtrl', function ($scope) {
    
    // create some random data
    var col1 = 'US,Germany,UK,Japan,Italy,Greece'.split(','),
        data = [];
    for (var i = 0; i < col1.length; i++) {
        data.push({
            col1: col1[i],
            col2: Math.round(Math.random() * 20000)
        });
    }

    // expose data as a CollectionView to get events
    $scope.data = new wijmo.collections.CollectionView(data);
});