formContext as a Ribbon function parameter in Unified Interface

Hello,

Just wondering how can I pass to a ribbon function the formContext so I can execute the getFormContext function. I am performing the call from the incident form.

I have this sorted in classic interface by passing the primaryControl as parameter. However, in UUI it's a different story as the object that is passsed as primaryControl doesn't expose such method:

Any hints? 

Thanks,

Jorge.