Dialog Box don't show the delete icon

Hello,

I have a dialog box and I would like to use the data-icon="delete" to print a delete icon on the left. But it doesn't print.

<div data-role="dialog" id="dialog">
<div data-role="header" data-theme="b">
<a class="ui-btn-left ui-btn ui-shadow ui-btn-corner-all ui-btn-icon-notext " data-iconpos="notext" data-icon="delete" href="musteri.php" data-corners="true" data-shadow="true" data-iconshadow="true" data-wrapperels="span" data-theme="b" title="Close" data-transition="pop" data-direction="reverse">
</a>
<h1>Détails congé</h1>
</div>
<div data-role="content" id="text">
</div>
</div>

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