Mark,

I'm trying to test run your above example with SQLAlchemy-ORM-tree-0.1.2 
and SQLAlchemy-0.8.0b2 

i get the following traceback, any suggestions, thanks

Traceback (most recent call last):
  File "./t.py", line 28, in <module>
    Node.tree.register()
  File 
"/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/manager/unmapped.py", 
line 216, in __get__
    return self._get_class_manager(root_node_class)
  File 
"/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/manager/unmapped.py", 
line 250, in _get_class_manager
    manager = self.class_manager)
  File 
"/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/options.py", line 
233, in class_mapped
    self.parent_field_name = self._get_parent_field_name()
  File 
"/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/options.py", line 
260, in _get_parent_field_name
    u"could not auto-detect parent field name; tree extension will not " \
ValueError: could not auto-detect parent field name; tree extension will 
not work property without a parent relationship defined

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