We are trying to add a parameter (token) to every ComboBox load request by setting it in the load config of the loader.

Below is sample code:
ComboBox<BeanModel> cmbMyStatus = new ComboBox<BeanModel>();
cmbMyStatus = new ComboBox<BeanModel>();
cmbMyStatus .setId("mystatus");
cmbMyStatus .setName("mystatus");
cmbMyStatus .setFieldLabel("My Status");
cmbMyStatus .setStore(getMyStatusStore());
cmbMyStatus .setValueField("myStatusId");
cmbMyStatus .setDisplayField("myStatusNm");
cmbMyStatus .setTypeAhead(true);
cmbMyStatus .setEditable(false);
cmbMyStatus .setToolTip("Select a Status...");
cmbMyStatus .setTriggerAction(TriggerAction.ALL);

binding.addFieldBinding(new ComboBoxFieldBinding(cmbMyStatus, "myStatusId"));

  private ListStore<BeanModel> getMyStatusStore() {
    ModelType type = new ModelType();
    final String url = URLBuilder.createURI("ws/status/mystatuses", false);
    RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);
    HttpProxy<String> proxy = new HttpProxy<String>(builder);
    JsonLoadResultReader<ListLoadResult<ModelData>> reader = new JsonLoadResultReader<ListLoadResult<ModelData>>(type);
    final BaseListLoader<ListLoadResult<ModelData>> loader = new BaseListLoader<ListLoadResult<ModelData>>(proxy, reader);
    ListStore<BeanModel> store = new ListStore<BeanModel>(loader);
    store.addListener(Store.DataChanged, new Listener<StoreEvent<?>>() {
      public void handleEvent(StoreEvent<?> be) {
    ModelData loadConfig = new BaseModelData();
    loadConfig.set("nonce", MyRegistry.getCSRFToken());
    return store;
But this parameter (token) is missing in the url. We have used the same code to load a Grid and the parameter is added to the url correctly.

What are we missing here? Is there any better way of handling this?