[Seaside] Re: Modal dialogs that appear with their "background"

[Stephan Eggermont]

The reason we want to use announcements in the way described, is that we
want to maintain the Seaside component structure: a component has no
knowledge about its parent, only about its children. The component knows 
how it wants to react to announcements sent by its children. So there is a 
one-way dependency direction. The result is better reusability of components.

Stephan