The most common use of title panes is as a title decoration for a pane, and so the class titled-object is provided as a class that supports placing title panes around itself.
"Title" is created automatically when a titled-object is created with
By default, a
title-pane is constrained so that it cannot resize (that is, the values of
t). This can be overridden by passing
:visible-max-width nil or
CAPI User Guide and Reference Manual (Macintosh version) - 25 Feb 2015