Arr.head(allTabs).each((tab) => TabSection.showTab(comp, tab.value));

 find: (comp) => Arr.head(AlloyTabSection.getViewItems(comp))

export const renderTabPanel = <I>(spec: TabPanelFoo<I>, backstage: UiFactoryBackstage): SketchSpec => {
  const storedValue = Cell<TabData>({ });

  const updateDataWithForm = (form: AlloyComponent): void => {
    const formData = Representing.getValue(form);
    const validData = toValidValues(formData).getOr({ });
    const currentData = storedValue.get();
    const newData = Merger.deepMerge(currentData, validData);
    storedValue.set(newData);
  };

  const setDataOnForm = (form: AlloyComponent) => {
    const tabData = storedValue.get();
    Representing.setValue(form, tabData);
  };

  const oldTab = Cell(null);

  const allTabs = Arr.map(spec.tabs, function (tab) {
    return {
      value: tab.title,
      dom: {
        tag: 'div',
        classes: [ 'tox-dialog__body-nav-item' ],
        innerHtml: backstage.shared.providers.translate(tab.title)
      },
      view () {
        return [
          // Dupe with SilverDialog
          AlloyForm.sketch((parts) => {
            return {
              dom: {
                tag: 'div',
                classes: [ 'tox-form' ]
              },
              components: Arr.map(tab.items, (item) => interpretInForm(parts, item, backstage)),
              formBehaviours: Behaviour.derive([
                Keying.config({
                  mode: 'acyclic',
                  useTabstopAt: Fun.not(NavigableObject.isPseudoStop)
                }),

                AddEventsBehaviour.config('TabView.form.events', [
                  AlloyEvents.runOnAttached(setDataOnForm),
                  AlloyEvents.runOnDetached(updateDataWithForm)
                ]),
                Receiving.config({
                  channels: Objects.wrapAll([
                    {
                      key: SendDataToSectionChannel,
                      value:  {
                        onReceive: updateDataWithForm
                      }
                    },
                    {
                      key: SendDataToViewChannel,
                      value: {
                        onReceive: setDataOnForm
                      }
                    }
                  ])
                })
              ])
            };
          })
        ];
      }
    };
  });

  // Assign fixed height or variable height to the tabs
  const tabMode = setMode(allTabs).smartTabHeight;

  return AlloyTabSection.sketch({
    dom: {
      tag: 'div',
      classes: [ 'tox-dialog__body' ]
    },

    onChangeTab: (section, button, _viewItems) => {
      const title = Representing.getValue(button);
      AlloyTriggers.emitWith(section, formTabChangeEvent, {
        title,
        oldTitle: oldTab.get()
      });
      oldTab.set(title);
    },

    tabs: allTabs,

    components: [
      AlloyTabSection.parts().tabbar({
        dom: {
          tag: 'div',
          classes: [ 'tox-dialog__body-nav' ]
        },
        components: [
          AlloyTabbar.parts().tabs({ })
        ],
        markers: {
//.........这里部分代码省略.........

 Composing.getCurrent(body).each((tabSection) => {
   TabSection.showTab(tabSection, title);
 });