sub closeTree {
    my $tree = shift;
    my ($entryPath, $hideChildren) = @_;
    my @children = $tree->info (children => $entryPath);

    return if ! @children;

    for (@children) {
        closeTree ($tree, $_, 1);
        $tree->hide ('entry' => $_) if $hideChildren;
    }
    $tree->setmode ($entryPath, 'open') if length $entryPath;
}