XEO Library Web Components - Creating a complex viewer - Movement

To finalize the creation of the XEO Library you'll create the most challenging viewer up until now. The Movement edit viewer is where librarians will create the movements of books (and returns) for a given user. When creating a new Movement, a librarian must be able to choose which user is going to take the books and select the list of books to take.

This viewer, must also allow the librarian to show which books haven't been returned and also to return any of the current books which have not been yet returned. To achieve this we'll create a viewer with three inner tabs (one for adding books to a new movement, one for displaying books which haven't been yet returned and another one to return a set of books.