Wijmo 5 - Context Menu on a FlexGrid

HTML

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="http://cdn.wijmo.com/5.latest/styles/wijmo.min.css">
<script src="http://cdn.wijmo.com/5.latest/controls/wijmo.min.js"></script>
<script src="http://cdn.wijmo.com/5.latest/controls/wijmo.grid.min.js"></script>
<script src="http://cdn.wijmo.com/5.latest/controls/wijmo.input.min.js"></script>
<script src="http://cdn.wijmo.com/5.latest/interop/angular/wijmo.angular.min.js"></script>
<div ng-app="app" ng-controller="appCtrl">
    
<h1>Context Menu on a FlexGrid</h1>

    <wj-flex-grid
        items-source="data"
        control="grid"
        initialized="init(grid)">
    </wj-flex-grid>
    
    <wj-menu 
    control="menuCtx"
        initialized="initMenu(menuCtx)"
        id="ctxMenu" 
        ng-show="false" 
        header="Context Menu" 
        item-clicked="menuItemClicked(s, e)">
        <wj-menu-item>Cut</wj-menu-item>
        <wj-menu-item>Copy</wj-menu-item>
        <wj-menu-item>Paste</wj-menu-item>
        <wj-menu-separator></wj-menu-separator>
        <wj-menu-item>Find</wj-menu-item>
        <wj-menu-item>Replace</wj-menu-item>
    </wj-menu>
</div>

CSS

.wj-flexgrid {
     height:200px;
}

JavaScript

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

// controller
app.controller('appCtrl', function ($scope) {

    // create some random data
    var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','),
        data = [];
    for (var i = 0; i < countries.length; i++) {
        data.push({
            country: countries[i],
            downloads: Math.round(Math.random() * 20000),
            sales: Math.random() * 10000,
            expenses: Math.random() * 5000
        });
    }

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

    // handle menu clicks
    $scope.menuItemClicked = function(s,e) {
        var menu = s;
        alert('Thanks for selecting option ' + menu.selectedIndex + ' from menu **' + menu.header + '**!');
    }
   
    
    $scope.initMenu=(menuCtx)=>{
    	var dropdown=menuCtx.dropDown;
      var gridHost=$scope.grid.hostElement;
      
      gridHost.addEventListener('click', function (e) {
                e.preventDefault();
                menuCtx.selectedIndex = -1;
                showPopup(dropdown, e);
                dropdown.focus();
            });
      dropdown.addEventListener('blur', function(e) {
                var t=0;
                if(e.relatedTarget&&wijmo.hasClass(e.relatedTarget,'wj-listbox-item')){
                	t=100;
                }
                setTimeout(function() {
                    dropdown.style.visibility = 'hidden';
                },t);
            });
      
      
      function showPopup(popup, ref) {

        // make sure popup is a child of the body
        var p = popup.parentElement;
        if (p && p != document.body) {
            p.removeChild(popup);
            p = null;
        }
        if (!p) {
            document.body.appendChild(popup)
        }

        // calculate popup position
        wijmo.setCss(popup, {
            visibility: 'hidden',
            display: ''
  ...