Creating customized objects

[sid]

I am going to create a plugin which will work with custom objects (not build it in EA):

I need to create a custom kind of class (which actually is not a class), a custom container (which needs to contain connectors and classes) and a custom connector.

These objects need to appear (and behave?) differently to others, graphically and also to the add-ins.

Any suggestion for the best way to do that?

I've tried getting out of this using shape scripts, tagged values and profiles (?) but couldn't get to the solution.

Any suggestion?

Thx in advance!