my $mw = MainWindow->new();
$mw->withdraw();

my $ftp_warn = $mw->messageBox(
  -title   => 'Downloading upgrade',
  -message => "We are about to download an upgrade to your software, do you wish to continue?",
  -type    => 'YesNo',
  -icon    => 'question',
);
if ( $ftp_warn eq 'No' ) {
  exit;
}
else {
  &doUpdate();
}