I was having the same query...but now its partially solved...
i am using Nested User Controls....
Like: I have a 'A' Usercontrol that contains the grid view
then a 'B' User Control that contains 'A' n one more user control
then a 'C' user Control that Contains 'B' and 2 more ajax control...
i want row command in the 'C' user control
On rowcommand click a modal popup control should be visible.
How can i achieve this....