Timer in Custom Activity

Question

When I place a timer on a base diagram I get a notification pin.  When I place a timer in an Activity block I only get an outgoing response pin.  

Why the difference and what is it telling me about the characteristics of an activity block?

TIA

tlc

 

Answer 1

You can see notification pin in Start method of custom Activity

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iagsav

Answer 2

OK, I think I get it.  Since it is an asynchronous event it doesn't depend on an input to the activity which makes Start the appropriate place.  

Thank you for the reply.