ajax cascading dropdown: second dropdown disabled

[acadam]

Hi,
I am trying to use cascading dropdown but I have some problems.
The firts dropdown is ok, it's filled regularly... but the second
dropdown is still disabled!! Why?
I tried to start my webmethod to check that method return the results
and it's all ok, I see all the results in the xml format.

What could be the problem? What should I check?

Thak you very much.

acadam