点击IE11后，jQuery UI Tooltip不会关闭

I have the following code:

我有以下代码：

<a class="btnDelete" href="/go.html?url=linkHere" onclick="OpenDialog(this); return false;" title="Delete">Delete</a>

function OpenDialog()
{
    $("#dialog-item-could-not-be-deleted").dialog({
        modal: true,
        title: 'Delete',
        zIndex: 10000,
        autoOpen: true,
        width: 'auto',
        resizable: false,
        closeText: 'Close',
        buttons: {
            OK: function ()
            {
                $(this).dialog("close");
                $('.btnDelete').tooltip("close");
            }
        },
        close: function (event, ui)
        {
            $(this).hide();
            $('.btnDelete').tooltip("close");
        }
    });
}
<a class