<demo>

### Vertical Navigation

A vertical menu with inline submenus.

```jsx live
<Menu mode="vertical" style={{ maxWidth: 256 }}>
  <Menu.Item>Navigation Three</Menu.Item>
  <Menu.Item>Navigation Two</Menu.Item>
  <Menu.Item disabled>Navigation Three</Menu.Item>
  <Menu.SubMenu title="Simple SubMenu">
    <Menu.Item>Menu Item 1</Menu.Item>
    <Menu.Item disabled>Menu Item 2</Menu.Item>
    <Menu.Item>Menu Item 3</Menu.Item>
    <Menu.Item>Menu Item 4</Menu.Item>
  </Menu.SubMenu>
  <Menu.SubMenu title="Submenu with ItemGroup">
    <Menu.ItemGroup title="Group 1">
      <Menu.Item>Item group 1 item 1</Menu.Item>
      <Menu.Item>Item group 1 item 2</Menu.Item>
    </Menu.ItemGroup>
    <Menu.ItemGroup title="Group 2">
      <Menu.Item>Item group 2 item 1</Menu.Item>
      <Menu.Item disabled>Item group 2 item 2</Menu.Item>
      <Menu.Item>Item group 2 item 3</Menu.Item>
    </Menu.ItemGroup>
  </Menu.SubMenu>
</Menu>
```

</demo>
