Vertical navigation using double Sidebar
We recommend implementing a double sidebar navigation with the help of DHTMLX Sidebar
and List widgets. If one of the sidebar items consists of many similar subitems,
you can present these subitems using the List widget. This type of navigation is
appropriate for enumerating people, objects, or subjects. The detailed information
on the element chosen from the List widget is shown to the right of the sidebar. You
can also combine a double sidebar with a toolbar at the top of the screen to display
settings, notifications, messages, and a user profile.