[web2py] SQLFORM.smartgrid - custom add form

[Jim Steil]

Hi

I'm implementing a custom 'add' form in my .smartgrid.  Once I've 
accepted the input values and updated the database I want to return the 
user to the page that got me to the add page.  If the page I'm returning 
to contains a .smartgrid then I need to pass in that user_signature 
thing.  I have no idea how to do that.  Can someone point me in the 
right direction?

Also, what would be the 'proper' way to determine that page that sent me 
to my add page.  One that would work even if the page failed validation 
a couple of times before being used?

    -Jim