My Ajax call replace a dropdown box,  then call
$('select').each(function () {
              $(this).selectBox();
            });

to update the jquery selectBox look and feel again.

but it caused the "setting is undefined: settings.menuTransition" error,

to fixed that need add

            $('select').each(function () {
                $(this).selectBox('destroy');
              
            });
Before the Ajax Call, so the next time you Initial it .the dropdown will be function..