I'm using 2.1.3 on IE 11 and the dialog doesn't center itself  Here's the actual code.  Just one thing does it's to put the initialization of the dialog in a setTimeout of 500 then it works.  How can I make sure it is centered without the setTimeout ?

1. $('#GenericDialog').dialog(
   {
       position: { my: 'center', at: 'center', of: window },
       width: 'auto',
      show: 'fade',
       hide: 'fade',
       showAnim: 'slow',
       title: 'Information de la prise',
       closeOnEscape: true,
       dialogClass: 'dialogWithDropShadow',
       close: function (event, ui) {
           $('#GenericDialog').empty();
       },
       open: function (event, ui) {
           $('#GenericDialog').dialog('option', 'position', 'center');
       }
   });
2. $('#GenericDialog').html(HTMLPopup).promise().done(function () {
       $('#GenericDialog').find('#TakeInformationHeader').css('background', TakeDetail.HourIndicatorColor);
       $('#GenericDialog').find('#TakeInformationHeaderProductName').css('color', TakeDetail.Color);
       $('#GenericDialog').find('#TakeInformationHeaderQuantity').css('color', TakeDetail.Color);
3.     $('#GenericDialog').find('#TakeInformationHeaderProductName').text(TakeDetail.ProductFullName);
       $('#GenericDialog').find('#TakeInformationHeaderQuantity').text('x ' + TakeDetail.ProductQuantity);
       $('#GenericDialog').find('#TakeInformationRegisteredHour').text('Administré à ' + TakeDetail.RegisteredHour);
       $('#GenericDialog').find('#TakeInformationAdministeredBy').text('par ' + TakeDetail.AdministeredBy);
       $('#GenericDialog').find('#TakeInformationAbreviation').text(TakeDetail.Abreviation + ' : ');
4.     $(TakeDetail.IncidentDetailInfos).each(function (index, item) {
           if (item.Selected) {
               var HTMLIncident = '<p style="margin-top:0;margin-bottom:0;width:40px;float:left">' + item.Abreviation + ' : </p>' +
                                   '<p style="margin-top:0;margin-bottom:0">' + item.Description + '</p>'
5.             $('#GenericDialog').find('#TakeInformationReactions').append(HTMLIncident);
           }
       });
   });