Tree structure - solution needed

Monday 02 January 2006 2:58:30 am

Hello,
I need to create tree structure like this:
- Element 1
-- Element 1.1
-- Element 1.2
- Elemtent 2
--Element 2.1
---Element 2.1.1
--Element 2.2
--Element 2.3
e.t.c

I'm tryin to get this using custom classes with relations to itself but it doesn't create tree structure.

I need that tree for thing like this:
There is Custom class - let's name it "Study". Every Study needs to be assigned to one or more Disciplines - and here comes our tree structure. How to create Disciplines structure?