Tooltip stays when button is disabled

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">
<button type="button" title="I'm a tooltip!">Click Me!</button>

JavaScript

$(document).tooltip();

    $('button').button();

    $('button').click(function () {
        $(this).button("disable");
    });