Sequence Diagrams and Statemachine Simulation

[Tehila1]

Hello,

I would like to understand how sequence diagrams can correspond and state-machines:

In sequence diagrams you show the message exchange between objects: EA allows only to show operations.
In EA StateMachines you have to use triggers.
But the triggers cannot be used in Sequence Diagrams!

How do these concepts play together?

[qwerty]

See http://www.uml-diagrams.org/sequence-diagrams.html below at  State Invariant. You can also place Triggers and State Machines directly on SDs.

q.