From the UX Elements project page:

This elements this module provides have been submitted as patches to http://drupal.org/project/elements
Any further development of this module is highly unlikely.

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David_Rothstein’s picture

David_Rothstein commented
Status: Active » Postponed

We can't do that for now, since the patches haven't been committed to the Elements module yet. It looks like these are the issues to follow:
#1034690: Add a horizontal tabs element
#1048968: Add a vertical accordion element