GTRR in original window
I have a script that iuses the GTRR and opens a new window. In this layout on the new window, I have a portal that lists all related invoices to that client. I have a button on eachportal line to take the user to that record using the invoice layout. I want this related invoice record and layout to appear on the original window that was used to go to the portal layout- how do i implement this?