How to use the ipyvuetify.Toolbar function in ipyvuetify

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']),
                                     vue.Tab(children=['Job Summary']),
                                     vue.TabItem(children=[config_tab(backend)]),
                                     vue.TabItem(children=[qubits_tab(backend)]),

options_panel = v.ExpansionPanels(
        v_model=[0, 1], multiple=True, accordion=True, style_='padding-left: 1px; min-width: 200px',
        children=[
            v.ExpansionPanel(children=[
                v.ExpansionPanelHeader(class_='font-weight-bold', children=['Viewer Options']),
                v.ExpansionPanelContent(children=[viewer.viewer_options])]),
            v.ExpansionPanel(children=[
                v.ExpansionPanelHeader(class_='font-weight-bold', children=['Layer Options']),
                v.ExpansionPanelContent(children=[viewer.layer_options])])])

    drawer = v.NavigationDrawer(v_model=False, absolute=True, right=True,
                                children=[sidebar_button,
                                          options_panel], width="min-content")

    toolbar = v.Toolbar(dense=True, class_='elevation-0',
                        children=[v.ToolbarItems(children=[viewer.toolbar_selection_tools,
                                                           viewer.toolbar_selection_mode,
                                                           viewer.toolbar_active_subset]),
                                  v.Spacer(),
                                  sidebar_button])

    layout = v.Html(tag='div', children=[
        toolbar,
        v.Row(no_gutters=True, children=[
            v.Col(cols=12, children=[viewer.figure_widget]),
            v.Col(cols=12, children=[viewer.output_widget])
        ]),
        drawer
    ])

    return layout