Here is a code to prove that your piece of code works okay, and an error is somewhere else.

Note that this is a quick and dirty mix of examples from Win32::GUI and your code, so please say nothing about quality of code.

Version of Win32::GUI is 0.0.558 (just upgraded :)

use Win32::GUI;

print "hwnd = $Win32::GUI::hwnd\n";
print "hinstance = $Win32::GUI::hinstance\n";

# GUI::Show($Win32::GUI::hwnd, 6);

#$Icon = new GUI::Icon("perl.ico");
#print "Icon: $Icon->{handle}\n";

my $win = new GUI::Window(
    -name => "Window",
    -style => WS_OVERLAPPEDWINDOW,
    -text => "Win32::GUI TEST - ListView",
    -height => 200, -width => 300,
    -left => 100, -top => 100,
);

$LV = $win->AddListView(
    -name      => "lvwData_Entered",
    -text      => "hello world!",
    -left      => 10,
    -top       => 10,
    -width     => 280,
    -height    => 180,
    -style     => WS_CHILD | WS_VISIBLE | 1,
    -fullrowselect => 1,
    -gridlines => 1,
    -checkboxes => 1,
#    -hottrack   => 1,
);

$LV1 = $win->AddButton(-name => "LV1", -text => "Big Icons",
                          -left => 10, -top => 200,
);

$LV2 = $win->AddButton(-name => "LV2", -text => "Small Icons",
                          -left => 10, -top => 230,
);

$LV3 = $win->AddButton(-name => "LV3", -text => "List",
                          -left => 10, -top => 260,
);

$LV4 = $win->AddButton(-name => "LV4", -text => "Details",
                          -left => 10, -top => 290,
);

$width = $LV->ScaleWidth;

#$LV->InsertColumn(-index => 0, -width => $width/2, -text => "Name");
#$LV->InsertColumn(-index => 1, -subitem => 1, -width => $width/2, -te
+xt => "Description");
#
#$LV->InsertItem(-item => 0, -text => "ciao", -image => 0);
#$LV->SetItem(-item => 0, -subitem => 1, -text => "greetings");
#$LV->InsertItem(-item => 1, -text => "abracabra", -image => 1);
#$LV->SetItem(-item => 1, -subitem => 1, -text => "magic word");
#
#$LV->TextColor(hex("0000FF"));
#
#
#
sub LV1_Click {
    print "BIG Icons!\n";
    $LV->View(0);
}

sub LV2_Click {
    print "small Icons!\n";
    $LV->View(2);
}

sub LV3_Click {
    print "List!\n";
    $LV->View(3);
}

sub LV4_Click {
    print "Details!\n";
    $LV->View(1);
}

    $win->lvwData_Entered->Clear();
    $win->lvwData_Entered->InsertColumn ( -text=>"Tape", -width=>80);
    $win->lvwData_Entered->InsertColumn ( -text=>"MFGDATE", -width=>80
+);
    $win->lvwData_Entered->InsertColumn ( -text=>"Library", -width=>80
+);
    $win->lvwData_Entered->InsertColumn ( -text=>"DateLoaded", -width=
+>80);
    
    $win->Show();
    
    $win->lvwData_Entered->InsertItem   ( -item=>0, -text=>"000234D");
    $win->lvwData_Entered->InsertItem   ( -item=>1, -text=>"000235D");
    $win->lvwData_Entered->InsertItem   ( -item=>2, -text=>"000236D");
    $win->lvwData_Entered->Update();
    
    #$win->tfLoad_TapeName->SetFocus();
    
    #print_dbg("Main()--Listview","Column must be ".$win->lvwData_Ente
+red->GetStringWidth("000000d").
    #        " characters wide.\n.");
    #print_dbg("Main()--Listview","There are ".$win->lvwData_Entered->
+Count()." tapes in list.\n");
    #print_dbg("Main()--Listview","First visible is ".$win->lvwData_En
+tered->GetFirstVisible()."\n");
    #print_dbg("Main()--Listview","View-mode: ".$win->lvwData_Entered-
+>View()."\n");
    #print_dbg("Main()--Listview","There are ".$win->lvwData_Entered->
+VisibleCount().
    #        " Viewable tapes in list.");

      show:;    
$win->Show();

$win->Dialog();

GUI::Show($Win32::GUI::hwnd);
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