That error was the easiest part..., I made a few changes and fixes and this is the result, to keep the development going :)

package MyForm;

use strict;
use warnings;

use Wx qw[:everything];             # easy when testing
use Wx::Event qw(EVT_BUTTON);
use base 'Wx::Frame';
use Wx::Perl::ListCtrl;

sub new {
    my $class = shift;

    my $self = $class->SUPER::new(
        undef,                      # parent window
        -1,                         # ID -1 means any
        'List Control Tutorial',    # title
        [ -1,  -1 ],                # default position
        [ 400, 300 ],               # size
    );

    # Add a panel so it looks correct on all platforms
    my $panel = Wx::Panel->new(
        $self,                      # parent window
        -1,                         # ID
    );
    my $idx       = 0;
    $self->{list_ctrl} = Wx::Perl::ListCtrl->new(
        $panel,
        -1,                         # ID
        #'Report',                  # label
        [ 20, 30 ],                 # position
        [ -1, 100 ],                # size
        wxLC_REPORT | wxBORDER_SUNKEN,    # window style
    );
    $self->{list_ctrl}->InsertColumn( 0, 'Subject' );
    $self->{list_ctrl}->InsertColumn( 0, 'Due' );
    $self->{list_ctrl}->InsertColumn( 0, 'Location' );
    my $btn = Wx::Button->new(
        $panel,                     # parent window
        -1,                         # ID
        'Add Line',                 # label
        [ -1, -1 ],                 # default position
        [ -1, -1 ],                 # default size
    );

    EVT_BUTTON(
        $self, $btn,
        sub {
            $self->add_line($idx);
            $idx++;
        }
    );

    my $sizer = Wx::BoxSizer->new(&Wx::wxVERTICAL);
    $sizer->Add( $self->{list_ctrl}, 0, wxALL | wxEXPAND, 5 );
    $sizer->Add( $btn,       0, wxALL | wxCENTER, 5 );
    $panel->SetSizer($sizer);

    return $self;
}    # end sub new

sub add_line {
    my ( $self, $idx ) = @_;

    my $line = "Line $idx";
    $self->{list_ctrl}->InsertStringItem( $idx, $line );

    return;
}  # end sub add_line

package MyApp;

use strict;
use warnings;
use base 'Wx::App';

sub OnInit {
    my $frame = MyForm->new;
    $frame->Show(1);
}

package main;

my $app = MyApp->new;
$app->MainLoop;
[download]

Regards, Stefan

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