641: Mainline
Both subpanes and top panes are views. In Smalltalk Express, views are
managed by a view manager.
A view manager serves as a command center,
enabling information to flow from one subpane to another:
- Instance methods defined for the view manager respond to requests for
action forwarded from top pane and subpane views in response to events.
- Instance methods defined for the view manager send messages to subpanes
asking for action.