title: how can I add checkbox in menu items,while my menuitems are dynamically loaded
body: <p>I did smthing like this..</p>
  
  <pre><code>    var mymenu = Ext.create('Ext.menu.Menu');
      for (var i = 0; i &lt; store.getCount(); ++i){
      var record = store.getAt(i);
  
      var menuItem =  Ext.create('Ext.menu.Item' ,{
          xtype: 'menucheckitem',               
          checked : false,
          text : record.data.rollName,
          value : record.data.rollId          
  
      });       
  
      mymenu.add(menuItem);
  }
  </code></pre>
  
  <p>but i am not getting checkbox in my menu.only Display field is visible.</p>