You forgot to pack your widgets. The widgets in Tk can be made, but they won't be seen until you pack, place or grid them onto the screen. Additionally, DynaTabFrame dosn't seem to expand a window, so you need to set a default size for the $mw.

#! /usr/bin/perl
use strict;
use warnings;
use Tk;
use Tk::DynaTabFrame;

my $mw = MainWindow->new();
$mw->geometry('200x200');
                               
                               
my $TabbedFrame = $mw->DynaTabFrame()
    ->pack(-side => 'top', -expand => 1, -fill => 'both');
                               
my $frame = $TabbedFrame->add(
           -caption => 'Tab 1',
           -tabcolor => 'yellow',
           -hidden => 0
      );

my $button = $frame->Button(
       -text => 'Button 1 on Tab 1' )->pack();

my $frame2 = $TabbedFrame->add(
              -caption => 'Tab 2',
              -tabcolor => 'red',
              -hidden => 0
      );

my $button2 = $frame->Button( -text => 'Button 1 on Tab 2' )->pack();

MainLoop();
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