How to generate the code from sequence diagram in enterprise architect?

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C++

UML

enterprise

Hi,
I'm generating the source code from the sequence diagram. I read the user guide of enterprise architect and stated that
To be able to generate code from behavioral models, all behavioral constructs should be contained within a Class.
http://www.sparxsystems.com/downloads/resources/booklets/uml_code_engineering.pdf[^]

Has anybody idea about how to generate correct code from sequence diagram?

Thank you.

What I have tried:

I used that method to generate the code but I'm able to get only class detail in generated code not any message detail.
There is no perfect example given for sequence diagram.