Task
Procedure
On the Tools menu, point to Change Diagram Type and choose BPMN Diagram. You cannot undo this command after you click Yes.
Event shapes change to start, intermediate, or end, depending on where they are placed in the flow, to maintain compliance with the BPMN specification. Some events, called intermediate or border events, are attached to activity boundaries when you model output exceptions.
Use the:
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Sequence flow line
to define the flow of transactions through the model. -
Message flow line
to send information, not transactions, between pools. This line style appears automatically when you draw a line between pools. -
Association line
for annotation and compensation flow, which is not part of the sequence flow. This line style appears automatically when you attach an artifact (a graphic object) to a shape.
The default sequence flow line 
indicates the default path when conditions exist on the flow out of an activity or gateway.
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On the Model menu, choose Check.
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In the Check dialog box, select the scope of errors to be checked. All error messages appear in the Output Window at the bottom of the iGrafx window.
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Double-click an error message to highlight the source of the error in the diagram.