Manual page:
  
   * http://tcllib.sourceforge.net/BWman/PanedWindow.html

From Tk 8.4 on, Tk has its own [panedwindow].

Examples on use of BWidget::PanedWindow:

 package require BWidget 
 
 # Create PanedWindow with 3 horizontal panes
 set pwh [PanedWindow .pwh -side top]
 pack $pwh -fill both -expand true
 
 set fh1 [$pwh add]
 set fh2 [$pwh add]
 set fh3 [$pwh add]
 
 # In second pane, add 2 horizontal panes
 set pwv [PanedWindow $fh2.pwv -side left]
 pack $pwv -fill both -expand true
 
 set fv1 [$pwv add]
 set fv2 [$pwv add]

 # Make large enough to be able to resize the panes
 wm geometry . 500x500

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[Jos Decoster] The following examples show the difference between '''extra''' and '''available''' values for the '''-weights''' option:

 package require BWidget 

 wm geometry . 500x500+200+200

 set f1 [frame .f1]
 set f2 [frame .f2]
 pack .f1 .f2 -fill both -expand true 

 # Create 3 panes where only extra space is divided among the different panes
 # relative to their weight.
 set pwh1 [PanedWindow $f1.pwh -side top -weights extra]
 pack $pwh1 -fill both -expand true
 set fh1_1 [$pwh1 add -weight 2]
 pack [text $fh1_1.txt] -fill both -expand true
 set fh1_2 [$pwh1 add -weight 2]
 pack [text $fh1_2.txt] -fill both -expand true
 set fh1_3 [$pwh1 add -weight 1]
 pack [text $fh1_3.txt] -fill both -expand true

 # Create 3 panes where all space is divided among the different panes
 # relative to their weight.
 set pwh2 [PanedWindow $f2.pwh -side top -weights available]
 pack $pwh2 -fill both -expand true
 set fh2_1 [$pwh2 add -weight 2]
 pack [text $fh2_1.txt] -fill both -expand true
 set fh2_2 [$pwh2 add -weight 2]
 pack [text $fh2_2.txt] -fill both -expand true
 set fh2_3 [$pwh2 add -weight 1]
 pack [text $fh2_3.txt] -fill both -expand true

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[Category Widget] of the [BWidget] extension