Here is a script to display each widget available in Tk. It made the assumption that all widgets begin with a lowercase letter.
#
# the dynamic list of Tk widgets
#
puts " Tk version [package require Tk]"
puts " ----"
set tkCommands [lsort [info commands "::tk::\[a-z\]*"]]
foreach cmd $tkCommands {
puts [string range $cmd 6 end]
}
exit It gives :
Tk version 8.5.7 ---- button canvas checkbutton entry frame label labelframe listbox mc mcmax mcmaxamp menubutton message panedwindow radiobutton scale scrollbar spinbox text toplevel
It works only with version 8.5 so far.
JH This completely misses the themed Tk widget set (::ttk::*).