A new feature has been added to the EA Navigator to navigate from an Operation to the Behavior set as its Method.
In my previous post UML Best Practice: One Operation = One Sequence diagram I explained how to set a behavior as the implementation of an operation in Enterprise Architect.
This feature is also available from Message context menu
Selecting the Implementation option will find the Behavior (Interaction, Activity or StateMachine) element that has been set as the Behavior of the operation
and select that element in the project browser.
More information about the EA Navigator add-in for Enterprise Architect can be found here: