invalid tree model struct in Xml

so i have problem with Xml component

my arry from find loks like that

array(
[Invoice] => array(...)
[Seler] => array(...)

so its good...

after
$xml = new Xml($invoice);
xml loks like that (this is stupid...)
<invoice ... /><seler ...></invoice>

after
$result = Set::reverse($xml);

arr loks like bad... that
array(
[Invoice] => array(
[Seler] => array(...)....
)

full example

App::import('Core','Xml');
debug($arr);
$xml = new Xml($arr);
debug($xml);
$arr = Set::reverse($xml);
debug($arr);
exit;

whats wrong ?
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