You have a really bad placement of your my $i = 0 line. But the reason your code dosn't work is you need to pack in the sub. 
#!/usr/bin/perl
use warnings;
use strict;
use Tk;
use Tk::DynaTabFrame;

my @tab;

my $top = MainWindow->new();
my $nb  = $top->DynaTabFrame->pack;

my $i = 0;

for(1..6){ &add_tab()};

MainLoop();

sub add_tab {
    $i++;
    print "adding  tab $i\n";
    $tab[$i] = $nb->add(
        -caption  => 'Tab label' . $i,
        -tabcolor => 'black',
    )->pack;

    $tab[$i]->Label( -text => 'dsdss' )->pack;
}

[download]
I'm not really a human, but I play one on earth. flash japh

In reply to Re^3: TK: adding notebook tabs dynamically by zentara
in thread TK: adding notebook tabs dynamically by water

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.