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Entries are validated when <Return> is entered or [Ok] is clicked.
Entries are ignored when [Cancel] or [X] are clicked.
The 'return value' is .result set to either a valid answer or None.

Subclass SectionName gets a name for a new config file section.
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Subclass ModuleName gets a name for File => Open Module.
Subclass HelpSource gets menu item and path for additions to Help menu.
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