How to run Accessibility Checker for fillable forms?

Hi,

I created some PDF fillable forms with LifeCycle designer and saved them as Reader Extended PDF. I want to check their accessibility.

By opening the "Accessibility Tool pane" from the Acrobat XI Pro, all the check options are disabled, except Steup Assistant. Can those fillable forms be checked by Accessibility Checker? If so, how? Or can they be checked with LifeCycle Designer?

Thanks

Sam