Set focus on textbox in AJAX POPUP Load

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Ajax

MVC

Hi Friends,
In my site, Login window open as POPUP using AJAX call.
Please refer below screen grab:
$('#hrefLogin').click(function () {
var url = $('#divLogin').data('request-path');

$.ajax({
url: url,
type: 'GET',
success: function (data) {
////Render the partial view HTML returned by the action method
$("#divLogin").html(data);

$.fancybox({
href: "#divLogin",
'maxWidth': 420, // set the width
'minHeight': 400,
'maxHeight': 400,
'height':'auto',
'autoSize': false
});

$.fancybox.update();

////Reparse html data to enable MVC data annotation work.
$('form').removeData('validator');
$('form').removeData('unobtrusiveValidation');
$.validator.unobtrusive.parse('form');
}
});
});

Login window have two input fields UserName and Password.
I need to set focus on UserName field when popup open.

Many Thanks,

Regards,
Lalitha