That's a great idea! I was thinking I could perhaps "destroy" the label and recreate it every time but that seemed a bit much to have to do. Since that label is the same size, overwriting it should be okay.

Update:

Worked like a charm!

Surprisingly enough, it doesn't seem to complain that you've got two labels in the same place, and will actually update depending on which one you choose.

use strict;
use Win32::GUI;

use constant COLOR => '#F4F2E8';

my ($redraw, $count);

$count = 0;

my $main = Win32::GUI::Window->new(
    -name       => 'Main',
    -text       => 'Redraw Test',
    -width      => 200,
    -height     => 100,
    -background => COLOR,
    -onTimer => \&redraw,
);

my $arrow_font = Win32::GUI::Font->new(
    -name => "Wingdings",
    -size => 28,
    -bold => 1,
);

$main->AddTimer( "redraw", 500 );

my $uparrow = $main->AddLabel(
            -text       => ' ',
            -left       => 55,
            -font       => $arrow_font,
            -foreground => [255,0,0],
            -background => COLOR,
            -top        => 10,
        );

my $dnarrow = $main->AddLabel(
            -text       => ' ',
            -left       => 55,
            -font       => $arrow_font,
            -foreground => [0,255,0],
            -background => COLOR,
            -top        => 10,
        );

$main->Show();

Win32::GUI::Dialog();

sub Main_Terminate {
    -1;
}

sub redraw{
  $count++;
  if ($count%2){
    $dnarrow->Text(chr(233));
  }
  else
     {$uparrow->Text(chr(234));}

}
[download]

The only thing that I found didn't work is to put '' in the text for the initial label. Once I changed that to ' ' all worked just fine.

Thanks again for the idea!