dialogextend doesn't reset

[posthy]

When i destroy the dialog and reopen it, the extended buttons are not present. Check out the next code:
<button id="open">Open</button>
<div id="window"></div>
<script>

$('#open').click(function(){
        $("#window").dialog({
            resizable: false,
            width: 340,
            maxHeight: '600px',
            open: function() {
                $.get('http://google.com', '', function(response) {
                    $('#window').html(response);
                }, 'html');
            },
            close: function() {
                $(this).dialog("destroy");
            }
        }).dialogExtend({collapsable: true});
});

</script>
The collapse button appears only at the first dialog open.
Using jqeury 2.1.3, jquery ui 1.11.4

I am having the same issue. Has this been resolved?