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Visio 2010 UML Sequence diagram - lifeline does not have enough connectors

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What does a lifeline represent in a UML sequence diagram?

In UML diagrams, such as sequence or communication diagrams, lifelines represent the objects that participate in an interaction. For example, in a banking scenario, lifelines can represent objects such as a bank system or customer. Each instance in an interaction is represented by a lifeline.

How does a sequence diagram work?

A sequence diagram is structured in such a way that it represents a timeline that begins at the top and descends gradually to mark the sequence of interactions. Each object has a column and the messages exchanged between them are represented by arrows.


I am using Microsoft Visio 2010.

I am drawing a UML sequence diagram.

I added object Lifeline and started drawing diagram. Because the diagram is very long, at one point there would not be any more connectors to connect the arrows to. See this picture:No more connectors

I understand that probably it is not good idea to put so many processes on one diagram, but it seems to me to be the best way to describe the whole process. And I only need a bit more space to continue the diagram!

So, how to configure the lifeline to have more connectors?