action() method
is an especially important event-handling method.
Only basic control components --
Button, Checkbox, Choice, List, MenuItem, and TextField objects --
produce action events.
They do so when the user indicates somehow
that the control should perform an action.
For example, when the user clicks a button,
an action event is generated.
By implementing the action() method,
you can react to user actions on controls
without worrying about the low-level events,
such as key presses and mouse clicks,
that caused the action.
A Note about the action() Method:
Action events are high-level events.
They're caused by one or more low-level events such as key and mouse presses.
For this reason,
it's OK to return true
to stop action events from travelling up the component hierarchy
after you've handled them --
the platform-specific code has already
handled the key or mouse events that triggered the action,
so it doesn't need to see the action event.
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