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This widget is intended for applications where the set of
content pages is static, or at least grows only at the
end. If there is a need for a widget to display a dynamically
changing set of pages, new external methods will be required to
support page insertion and deletion at arbitrary locations in the
list of content pages. A particularly Pythonic way to do that
might be to mimic the methods on list types such as .insert(), .append(), and
the del statement.
In any event, the addition of such features will require a serious rethinking of the internal attributes that manage the content pages.