Using Custom Events and DTOs are a way to move data around the application. With Flex’s event-driven architecture, a component can trigger an event and have it carry some data. This data will be encapsulated in a Data Transfer Object which most of these programmers consider as “dumb object” simply because it only serves as a data holder and does nothing more… no functionalities, no extra processing.
I would like to make this explanation and the accompanying codes AS SIMPLE AS POSSIBLE. I won’t be concerned with the aesthetics of the sample application, I’d like you to see it in barebones. So don’t complain if the app is ugly. 
For this discussion, let’s try to make a basic contact/email form. It should have fields for the recipient, sender, subject and body. This will not send the actual email but for purposes of demonstration, we’ll just populate the gathered data into another component.
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