Native tooltip is displayed for disabled element

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.0/jquery-ui.js"></script>
<link rel="stylesheet" href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.0/themes/vader/jquery-ui.css">
<div>
    <p>The native tooltip is displayed for a disabled element. Hover over the lock icon to see an example.</p><br>
</div>
<div>
    <button id="First" title="Hello!">test</button>
    <br><br>
    
</div>

JavaScript

$('#First').button({
    icons: {
        primary: "ui-icon-locked"
    },
    text: false
}).tooltip();