Test Case Boilerplate
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HTML
<script src="http://code.jquery.com/ui/jquery-ui-git.js"></script>
<link rel="stylesheet" href="http://code.jquery.com/ui/jquery-ui-git.css">
<div id="box">
<div>
<input type="text"/>
</div>
</div>
<div id="target"></div>
JavaScript
var box = $('#box').detach();
var input = box.find('input');
input.autocomplete({
source: ['hello', 'world'],
appendTo: input.parent()
});
box.appendTo('#target');