Form Generation Library

[eluser]Jeffrey Lasut[/eluser]
[quote author="macigniter" date="1251229390"]
Why would you want to load a library from within the form generation code?[/quote]

The auth library I'm using is Tank Auth, and de method checking de login password and hash against the database is located in the library, the models are only used to update, insert and delete the information from the database.
Within the library method I would like to use the form generation validation:

Code:

$form->add_error('password', 'You entered a bad password.');

Any suggestions or other solutions?

jeffrey