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#!/usr/bin/perl --
use strict;
use warnings;
...
$tree->ExpandAll;
$frame->Show(1);
Wx::SimpleApp->new->MainLoop;

    $self -> {treechecker} = Wx::Perl::TreeChecker->new(
        $panel,
...
        | Wx::wxTR_HIDE_ROOT()
        ^ Wx::wxTR_LINES_AT_ROOT()
    );

            if( $tree ->IsEmpty ){
                $tree -> AddRoot('/');
...
            my $root = $tree->GetRootItem; 
            my $stream_id = $tree-> AppendItem( $root, $stream  );
            _populate_tree($tree, $stream_id, $data->{$stream});