default tab not apper  #158

export const Tabs: TabsComponent = ({ state: outerState, children }) => {
  const innerState = useState(1)
  const elements = useConstant(() => ({ tabs: 0, panels: 0 }))
  const state = outerState || innerState

  return (
    <Elements.Provider value={elements}>
      <TabsState.Provider value={state}>{children}</TabsState.Provider>
    </Elements.Provider>
  )
}