update parent from child problem

[Guest]

Hi,

I have a webformParentA and webformChildB.
WebformParentA contains many controls(textbox, dropdownlist.....) and a
GridView object. From webformParentA I open webformChildB using javascript
code : window.open(....).
When I close webformChildB I must update the GridView object in the
webformParentA. For this I use the session object and wen I close
webformChildB I use the code window.opener.location........ to refresh
webformParentA. The GridView object is updated but I lose the data that I
have chaged in the others controls.

How can I update only the GridView object in the webformParentA from
webformChildB without to lose the other data?

thanks