my ($self, $icon);
	$self = $OBJECT_REF;
	$icon = shift;

	if (defined($self->{icon_theme})) {
		$self->{icon_theme}->rescan_if_needed;
	} else {
		PerlPanel::load_icon_theme($self);
	}

	if ($icon eq '') {
		return undef;

	} elsif (-f $icon) {
		return $icon;

	} else {
		# remove everything after the last dot:
		$icon = basename($icon);
		$icon =~ s/\..+$//g;

		my $info = $self->{icon_theme}->lookup_icon(lc($icon), 48, 'force-svg');

		if (!defined($info)) {
			return undef;

		} else {
			return $info->get_filename;

		}
	}