[flexcoders] How to register a dynamicEvent in an Actionscript class

[flexcoder2008]

I have seen numerous examples of registering a dynamicEvent in a
component's mxml such as:

[Event (name="rowSelected", type="mx.events.DynamicEvent")]

If I have an actionscript class that dispatches a dynamicEvent, what
is the syntax for this?

I want to dispatch a dynamicEvent from an actionscript class, and I
want my module to listen for that event.