Problem Creating a query for a hierarchical tree. [using connect by prior]

Hi all,
I have 2 tables.
box (box_id, box_name)
item(item_id, item_name, box_id)
In a box there are several items.
I want to create a hierachical tree to display items that are present in each box.
LIKE:
|---BOX1
| |----ITEM 1
| |----ITEM 2
|
|---BOX2
| |----ITEM 1
| |----ITEM 2
Currently i am trying this query:
SELECT -1 state, box_name, 'icon' icon, box_id val
from box b, item i;
I don't know what value to put for level, i don't know how to code the 'connect by prior' part.
Could you please advise me?
Michaël.
PS. Then i will eventually use this query in forms builder.

Note the name of this forum is "SQL Developer *(Not for general SQL/PLSQL questions)*" - so only for issues with the SQL Developer tool. Please post these questions under the dedicated SQL And PL/SQL forum.
Regards,
K.

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