I add tab use PartialView
public ActionResult AddTab(string containerId)
{
     var result = new PartialViewResult
     {
         ViewName = "PosInvoicePartialView",
         ContainerId = containerId,
         RenderMode = RenderMode.AddTo
     };

     this.GetCmp<TabPanel>("POSTabs").SetLastTabAsActive();

     return result;
}
Here is my PosInvoicePartialView
@(Html.X().Store().ID("LookupItemStore").AutoLoad(false)
      .Proxy(Html.X().AjaxProxy()
          .Url(Url.Action("LookupData", "Index", new { area = "Item" }))
          .Reader(Html.X().JsonReader().RootProperty("data").TotalProperty("total"))
      )
      .Model(Html.X().Model()
          .IDProperty("Id")
          .Fields(
              new ModelField("Id", ModelFieldType.Int),
              new ModelField("OrganizationCode", ModelFieldType.String),
              new ModelField("Code", ModelFieldType.String),
              new ModelField("Description", ModelFieldType.String)
          )
      )
)


@(Html.X().Panel()
              .Closable(true)
              .Layout(LayoutType.Border)
              .Title("POS - " + DateTime.Now.ToLongTimeString())
              .Items(
                  Html.X().Panel()
                      .Header(false)
                      .Region(Region.North)
                      .Border(false)
                      .Layout(LayoutType.HBox)
                      .BodyPadding(5)
                      .Defaults(Html.X().Parameter().Name("margin").Value("0 5 0 0").Mode(ParameterMode.Value))
                      .LayoutConfig(new HBoxLayoutConfig { Align = HBoxAlign.Top })
                      .Items(
                          Html.X().ComboBox()
                              .Width(400)
                              .DisplayField("Code")
                              .ValueField("Id")
                              .FieldStyle("text-transform: uppercase;")
                              .TypeAhead(true)
                              .MinChars(0)
                              .PageSize(10)
                              .SelectOnTab(true)
                              .ForceSelection(true)
                              .ValidateOnBlur(true)
                              .ValidateOnChange(true)
                              .ListConfig(Html.X().BoundList()
                                  .LoadingText("Searching...")
                                  .ItemTpl(Html.X().XTemplate()
                                      .Html(@<text>
                                                <div class="search-item">
                                                    <h3>{Code}</h3>
                                                    {Description}
                                                </div>
                                             </text>)
                                  )
                                  .MinWidth(400)
                              )
                              .StoreID("LookupItemStore"),
                          Html.X().Button().Icon(Icon.Find).Text("Search")
                      ),
                      Html.X().Panel()
                        .Title("Items Detail")
                        .Region(Region.Center)
                        .BodyPadding(5),
                      Html.X().FormPanel()
                        .Title("Invoice Information")
                        .Region(Region.East)
                        .MinWidth(400)
                        .Split(true)
                    )
)
But it has error when running
Uncaught TypeError: Cannot read property 'isEmptyStore' of undefined
at ctor.getStoreListeners (ext.axd?v=4.5.1:20)
at ctor.bindStoreListeners (ext.axd?v=4.5.1:20)
at ctor.bindStore (ext.axd?v=4.5.1:20)
at ctor.bindStore (ext.axd?v=4.5.1:20)
at ctor.initComponent (ext.axd?v=4.5.1:20)
at ctor.callParent (ext.axd?v=4.5.1:20)
at ctor.initComponent (ext.axd?v=4.5.1:733)
at ctor.constructor (ext.axd?v=4.5.1:20)
at new ctor (ext.axd?v=4.5.1:20)
at Object.widget (ext.axd?v=4.5.1:20)
Please help me

Thanks in advance