Add via option in padstack editor is grayed out

I need to add some vias in the design.  I have a integrated project that I have done and I need to add a couple of vias for routing and pouring now.

The add via button is greyed out.  How do we add the additional vias?  In a old "normal" design we have full control.  Is it dictated on the front end in xDX ?

Thanks,

Lyle