There have been several posts recently on clt, concerning the use
of the text widget.  Since I couldn't readily find the links to the
existing examples that I have seen before, well here goes:
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 menu .menubar -type menubar
 .menubar add cascade -label File -menu .menubar.file -underline 0

 #file menu
 menu .menubar.file -tearoff 0
 .menubar.file add command -label "New" -underline 0 \
 -command { new } 
 .menubar.file add command -label "Open..." -underline 0 \
 -command 
 set fileid [open $filename r]
 set data [read $fileid $filesize]
        close $fileid
 .text.t insert end $data
 wm title . $filename
 }

 proc save { } {
 set data [.text.t get 1.0 {end -1c}]
 set fileid [open $filename w]
 puts -nonewline $fileid $data
 close $fileid
 }

 proc file_save_as { } {
 global filename
 set data [.text.t get 1.0 {end -1c}]
 set file_types {
  {"Tcl Files" { .tcl .TCL .tk .TK} }
  {"Text Files" { .txt .TXT} }
  {"All Files" * }
 }

 set filename [tk_getSaveFile -filetypes $file_types\
 -initialdir pwd -initialfile $filename\
 -defaultextension .tcl]
 wm title . $filename
 set fileid [open $filename w]
 puts -nonewline $fileid $data
 close $fileid
 }

 tk appname "Edit"
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I know this could have been even more minimalist, but thought this
would answer most of the recent questions I have seen.  Left one
little glitch in here on purpose... Also, no error handling.

Hope this is helpful to someone.  I remember (not too long ago), how
long it took me to get this far working out of a book :^) ''so''
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Also, please note that the menu in the above script requires tcl/tk
8.0 or higher.  There are some grab problems with this type of a menu
when running Gnome. ''so"
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A really minimal example is of course this one-liner:
 if 0 {
     pack [text .t -wrap word] -fill both -expand 1
 }
Even though it doesn't have a scrollbar, you can scroll with middle mouse-button held down. And you can paste into it, copy from it... all from one line of Tk code :^) [RS]
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[Category Example] | [Category GUI]