Hello Takamoto,

I made 3 changes to the code shown:

(1) Changed use Tk::Notebook; to use Tk::NoteBook; (note the uppercase letter B).

(2) Added:

my $CkMergedWindow1;
my $CkMergedWindow2;
my $CkMergedWindo3;
[download]

to get the code to compile, as per tybalt89’s observation above.

(3) Changed this line:

my $PaneT = $page2->Scrolled('Frame',
[download]

to this:

my $PaneT = $page2->Scrolled('NoteBook',
[download]

The resulting “right” tab now appears left-aligned, as desired. However, despite the call to Scrolled, there are still no scroll bars. :-(

Hope that helps (a little),

After playing around a little bit, I came out with a solution. Here is the final code.

use strict;
use warnings;
use Tk;
use Tk::NoteBook;
use Tk::Pane;

my (@packWidgetTopTitel) = qw/-side top -anchor w -pady 1m/;
my (@packWidgetTop) = qw/-side top -anchor w/;

my $CkAtSearchUserDatabase;
my $CkMergedWindow1;
my $CkMergedWindow2;
my $CkMergedWindow3;

my $mw = MainWindow->new();
my $book = $mw->NoteBook(-relief => 'flat')->pack(-side => 'top' , -ex
+pand => '1', -fill => "both", -ipadx => 6, -ipady => 6);    
    my $page1 = $book->add( "Sheet1", -label=>'left');
    my $page2 = $book->add( "Sheet2", -label=>'right');

    #left
    $page1->Label(-text => "OFF-LINE RESOURCES")->pack(@packWidgetTopT
+itel);
        $page1 -> Checkbutton(-text=>"My old data", -variable=>\$CkAtS
+earchUserDatabase)->pack(@packWidgetTop);
    
    #right
    my $PaneT = $page2->Scrolled('Pane',
        -scrollbars => 'oe',
    )->pack(-anchor=> 'w');
        $PaneT->Label(-text=>"ON-LINE RESOURCES")->pack(@packWidgetTop
+Titel);
        $PaneT -> Checkbutton(-text=>"YXX", -variable=>\$CkMergedWindo
+w1)->pack(@packWidgetTop);    
        $PaneT -> Checkbutton(-text=>"XYX", -variable=>\$CkMergedWindo
+w2)->pack(@packWidgetTop);    
        $PaneT -> Checkbutton(-text=>"XXY", -variable=>\$CkMergedWindo
+w3)->pack(@packWidgetTop);    
MainLoop;
[download]

Thank you for the help.

No, actually it doesn't work. The Pane/Frame doesn't occupy the whole space, which can be seen reducing the height of the widget until the Scroll- bar is displayed. A bit puzzled...

Try this

#!/usr/bin/perl

# https://perlmonks.org/?node_id=1231884

use strict;
use warnings;
use Tk;
use Tk::NoteBook;
use Tk::Pane;

my (@packWidgetTopTitel) = qw/-side top -anchor w -pady 1m/;
my (@packWidgetTop) = qw/-side top -anchor w/;

my $CkAtSearchUserDatabase;
my $CkMergedWindow1;
my $CkMergedWindow2;
my $CkMergedWindow3;

my $mw = MainWindow->new();
my $book = $mw->NoteBook(-relief => 'flat')->pack(-side => 'top' , -ex
+pand => '1', -fill => "both", -ipadx => 6, -ipady => 6);  
  my $page1 = $book->add( "Sheet1", -label=>'left');
  my $page2 = $book->add( "Sheet2", -label=>'right');

  #left
  $page1->Label(-text => "OFF-LINE RESOURCES")->pack(@packWidgetTopTit
+el);
    $page1 -> Checkbutton(-text=>"My old data", -variable=>\$CkAtSearc
+hUserDatabase)->pack(@packWidgetTop);
  
  #right
  my $PaneT = $page2->Scrolled('Pane',
    -scrollbars => 'osoe',
    -sticky => 'nsew',
  )->pack(-anchor=> 'w', -fill => 'x');
    $PaneT->Label(-text=>"ON-LINE RESOURCES")->pack(@packWidgetTopTite
+l);
    $PaneT -> Checkbutton(-text=>"YXX", -variable=>\$CkMergedWindow1)-
+>pack(@packWidgetTop);  
    $PaneT -> Checkbutton(-text=>"XYX", -variable=>\$CkMergedWindow2)-
+>pack(@packWidgetTop);  
    $PaneT -> Checkbutton(-text=>"XXY", -variable=>\$CkMergedWindow3)-
+>pack(@packWidgetTop);  
MainLoop;
[download]

Does not compile