Each of the widgets that is wrapped by Poet (see Tier 2)
results in two files, one in tier 2a and one in tier 2b.
Tier 2a is the automatically-generated code, consisting mostly of
declarations for the slots that match each wrapped widget's options.
The corresponding tier 2b file is only generated if it doesn't
already exist. Most of these files just load the tier 2a file,
but a few have additional methods that extend the widgets. This
is where the documentation on those methods ends up.
Since most widgets do not have additional methods, most of the entries
in this section have no interesting content. Refer to the Tk, Ttk, or
BWidget documentation to discover what slots are defined for the
corresponding Poet widgets.