Serenity: Validation client side an extra dialog in OtherFormInTab example

[Estrusco]

How I can validate client side an extra dialog in OtherFormInTab example?
If I confirm second form without insert CompanyName I get database excpetion.
I would like to make to perform a .validateForm() for client validation, but I don't know how to accomplish this work.

Thank you

[volkanceylan]

Added validation to that sample in 2.5.4.1

[Estrusco]

Thank you very much @volkanceylan , I love you! :-)