Example: File Viewer (1)
# Create the panes
set mainPW [tixPanedWindow .p -orient vertical]
pack $mainPW -expand yes -fill both -padx 4 -pady 4
set top [$mainPW add top -expand 1 -size 300]
set bot [$mainPW add bot -expand 1 -size 200]
$top config -bd 0; $bot config -bd 0
set topPW [tixPanedWindow $top.p -orient horizontal]
pack $topPW -expand yes -fill both
set left [$topPW add left -expand 1]
set right [$topPW add right -expand 3]
$left config -bd 0
$right config -bd 0