/usr/share/doc/iwidgets4-doc/demos/buttonbox is in iwidgets4-doc 4.0.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# DEMO: buttonbox in [incr Widgets]
# ----------------------------------------------------------------------
package require Iwidgets 4.0
iwidgets::buttonbox .bb
.bb add OK -text OK -command "puts OK"
.bb add Apply -text Apply -command "puts Apply"
.bb add Cancel -text Cancel -command "puts Cancel"
.bb default OK
pack .bb -expand yes -fill both
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