. configure -menu .mbar
menu .mbar
.mbar add cascade -label "File" -underline 0 -menu .mbar.file
menu .mbar.file
.mbar.file add command -label "New" -underline 0 -command {}
.mbar.file add command -label "Open" -underline 0 -command {}
.mbar.file add command -label "Save" -underline 0 -command {}