title: Cannot get value of HtmlAttributes item in kendo MVC treeview
body: <p>I am using the Kendo MVC wrapper extensions to create a TreeView from my models. I would like to pass some data from the model with HtmlAttributes to the view. 
  Here is my Action :</p>
  
  <pre><code>public ActionResult Index()
      {
          var nodeList = new List&lt;TreeViewItemModel&gt;();
          nodeList.Add(new TreeViewItemModel
          {
              Id = "1",
              Text = "Item 1",
              HasChildren = true,
              HtmlAttributes = new Dictionary&lt;string, string&gt;
              {
                  {"class","XXXX"}
              },
              Items = new List&lt;TreeViewItemModel&gt;
                  {
                      new TreeViewItemModel{Id="1.1", Text = "sub Item 1.1",HasChildren = false},
                      new TreeViewItemModel{Id="1.2", Text = "sub Item 1.2",HasChildren = false}
          });
          nodeList.Add(new TreeViewItemModel { Id = "2", Text = "Item 2", HasChildren = false });
  
          return View(nodeList);
      }
  </code></pre>
  
  <p>Here is my view :</p>
  
  <pre><code>@using Kendo.Mvc.UI
  @model IEnumerable&lt;Kendo.Mvc.UI.TreeViewItemModel&gt;
  @(Html.Kendo().TreeView()
  .Name("treeView")
     .BindTo(Model)
     .DragAndDrop(true)
              )
  </code></pre>
  
  <p>Here is the element from Chrome</p>
  
  <pre><code>&lt;li class="k-item k-first" data-id="1" data-uid="6263f4c5-85f3-446c-a843-7d3786fb0f68" role="treeitem" id="treeView_tv_active"&gt;
  </code></pre>
  
  <p>As you can see there  isn't any class:XXX in my li Tag So  how can I give The XXX class to li Tag?</p>