[development] Form altering in ajax

[luca capra]

Hi all,
I'm trying to include a form from a module trought a ajax callback on D7 
[1].
Actually I got a button #ajax-ed which load the form in a wrapper on the 
page.

The form is altered in callback to make it ajax enabled, specifing #ajax 
settings plus custom #submit & #validate callback.
The form loads correctly, but, when submitting, it post the whole page 
to /system/ajax, on a blank page (or without ajax it post to the correct 
path but not triggering the custom #submit).

I've tryed both drupal_get_form and drupal_build_form with custom 
form_state settings (eg. no_cache, rebuild) to skip/force rebuild of 
form (and cache).


Thanks in advance,
Luca

[1] http://drupal.org/node/1218474#comment-4744608