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Francis,
In UML2, a Collaboration diagram is only structural therefore no messages. It is the Communication diagram that is behavioral and has messages. Both Sequence and Communication diagrams are Interaction diagrams. I remember that in UML1, the Communication diagram was called Collaboration. This might be the confusion. I know that some modeling tools like PowerAMC convert Sequence into Communication and vice-versa. StarUML could develop it or a third party could develop such an extension.