[jQuery] using blockUI to block a select/dropdown list

[Tom]

Hi

I am trying to use blockUI to block a select/dropdown list named
'srv_voice' when an AJAX request is being processed.

Code is simply

$('select[name=srv_voice]').block();

I have used

$().ajaxStart($.blockUI).ajaxStop($.unblockUI);

to block the whole page so that part of the plugin works. Likewise I
have also blocked other div elements on the page. Why can I not block
this select box?

Does this plugin only support certain elements?

Thanks
Tom