Where does 'Message' pick list come from (Seq Dia)

[Kap]

Did a few searches, tried RTFM, no avail.  Too obvious perhaps?

I don't see where the pull down list of messages comes from in a sequence diagram.  Right click on message, in the Signature area, Message: <list>.  Currently empty in the diagram I am working.

Thanks for a look and answer!

[g.makulik]

It comes from the element types operations that provides the targeted lifeline of the message. You can directly go to the operation definition dialog using the '...' button next to the drop down.

HTH
Günther

[Kap]

Ok, thanks Gunther!  

For some reason I expected to be able to select a message object, i.e. class typed as xml...