title: Kendo Multiselect in Popup Window returns null values for added items
body: <pre><code>&lt;div style="padding-right: 73px"&gt;
          @(Html.Kendo().MultiSelectFor(m =&gt; m.DisciplinesID)
          .DataValueField("Value")
          .DataTextField("Text")
          .Value(Model.DisciplineSelectedList)
          .DataSource(dataSource =&gt; dataSource
              .Read(read =&gt; read.Action("GetDisciplines", "Patron", new { id = Model.Id }))
          )
          .Placeholder("Select Disciplines...")
      )
      &lt;/div&gt;
  </code></pre>
  
  <p>When selecting new items from dropdown the value added to the ID's List has a value of null</p>