The dropdown onchange is not working anymore

I put two dropdown boxes on a Flash movie; when the first one changes, the second should repopulate. Now since some changes have been applied to the file at the end, the onchange effect is no longer working :frowning: I placed a trace statement in the handler routine but unfortunately it is not printed in debug mode :frowning:
Any suggestions are appreciated, an example of OnChange effect would be very useful.
Thank you