How to use the ipyvuetify.TabItem function in ipyvuetify

backend.name(),
                                            cred.hub,
                                            cred.group,
                                            cred.project)],
                                                         style_="color:white")]),
                        vue.Tabs(vertical=True,
                                 children=[
                                     vue.Tab(children=['Configuration']),
                                     vue.Tab(children=['Qubits']),
                                     vue.Tab(children=['Multi-Qubit Gates']),
                                     vue.Tab(children=['Error map']),
                                     vue.Tab(children=['Job Summary']),
                                     vue.TabItem(children=[config_tab(backend)]),
                                     vue.TabItem(children=[qubits_tab(backend)]),
                                     vue.TabItem(children=[gates_tab(backend)]),
                                     vue.TabItem(children=[iplot_error_map(backend,
                                                                           as_widget=True)]),
                                     last_tab])
                    ])

    # Load job data async for a bit better performance
    thread = threading.Thread(target=_async_job_loader,
                              args=(last_tab, backend))
    thread.start()

    display(card)

vue.ToolbarTitle(children=['{} @ ({}/{}/{})'.format(
                                            backend.name(),
                                            cred.hub,
                                            cred.group,
                                            cred.project)],
                                                         style_="color:white")]),
                        vue.Tabs(vertical=True,
                                 children=[
                                     vue.Tab(children=['Configuration']),
                                     vue.Tab(children=['Qubits']),
                                     vue.Tab(children=['Multi-Qubit Gates']),
                                     vue.Tab(children=['Error map']),
                                     vue.Tab(children=['Job Summary']),
                                     vue.TabItem(children=[config_tab(backend)]),
                                     vue.TabItem(children=[qubits_tab(backend)]),
                                     vue.TabItem(children=[gates_tab(backend)]),
                                     vue.TabItem(children=[iplot_error_map(backend,
                                                                           as_widget=True)]),
                                     last_tab])
                    ])

    # Load job data async for a bit better performance
    thread = threading.Thread(target=_async_job_loader,
                              args=(last_tab, backend))
    thread.start()

    display(card)

def backend_widget(backend: Union[IBMQBackend, FakeBackend]) -> None:
    """Display backend information as a widget.

    Args:
        backend: Display information about this backend.
    """
    cred = backend._credentials
    last_tab = vue.TabItem(children=[])
    card = vue.Card(height=600, outlined=True,
                    children=[
                        vue.Toolbar(flat=True, color="#002d9c",
                                    children=[
                                        vue.ToolbarTitle(children=['{} @ ({}/{}/{})'.format(
                                            backend.name(),
                                            cred.hub,
                                            cred.group,
                                            cred.project)],
                                                         style_="color:white")]),
                        vue.Tabs(vertical=True,
                                 children=[
                                     vue.Tab(children=['Configuration']),
                                     vue.Tab(children=['Qubits']),
                                     vue.Tab(children=['Multi-Qubit Gates']),
                                     vue.Tab(children=['Error map']),