I have tried the following, its working fine
$dk.bind('focus.dropkick', function (e) {
$dk.addClass('dk_focus');
}).bind('blur.dropkick', function (e) {
$dk.removeClass('dk_open dk_focus');
});
$('body').click(function (event) {
if (!$(event.target).parents('.dk_container').length || $(event.target).parent().attr('id') != $dk.attr('id')) {
_closeDropdown($dk);
}
});