A short comment:

To create a sensible data aware treeview is not something for the
simpleminded like me, that's for sure.

However, I am using a treeview syndrom in my current creation. I use
only one Node table which basically covers one ID field, one Parent
field, one Owner field, one Caption field and one TableID field.

Based on this one node file, I create a treeview unlimited on levels
and able to pick up data from any table based on the TableID.

Good luck though!

Kind regards,
Svein