Entity Reference Tree Widget (old)

Based on the fabulous Taxonomy Term Reference Tree Widget, this module aim to extend its functionality to display any type of hierarchical entities in a tree view selection.

This version includes a term reference tree and a group audience tree that works with OG group audiences.

It also provides hook_get_entity_hierarchy, so that you can define your own entity tree

You may find all documentation needed on http://drupal.org/project/term_reference_tree

For OG groups tree, the widget depends on OG Tree Views