[Tinyos-help] Adding new events

[robycannone at tele2.it]

Hi everyone,
I'm trying to add new events in tinydb. I have notices 
that in the file CommandMsgs.java the class EventMsg 
doesn't exist. Now, what should i do? Do I have to 
implement this class? There are also another file called 
CommandMsg.java but that reports "This class is 
automatically generated by mig". What does it mean?  Do I 
have to implement CommandMsg.java?
Any advice?
Thank you.