To view context and content of a message in a service instance,  select the required message(circle) by a mouse click.  The image depicts the representation of a selected message.

Viewing Message Context and Content   , The selected message changes it border colour from white to grey on selection.


On selection of a message, to view message context click on the context tab in right panel.

service instance message context

On selection of a message, to view message content click on content tab in right panel.

biztalk service instance message content