Presenting a dialog in response to an appStopEvent isn't a good idea from a
Zen of Palm user interface design perspective. The user isn't supposed to
have to think about saving the data they entered or about shutting down
applications. If the user hits a hard button to launch another application,
it is almost always best if your application exits without bothering the
user. The OS helps make this easy by defining the concept of a default
button for dialogs, so that you can easily specify what should happen if the
dialog is open when the user switches to another application. For the
non-modal forms, it's up to you to write the code to save the data entered.
-- 
Peter Epstein

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