jQuery Grid Plugin - jqGrid

Hi, i have a problem using the subgrid and the scroll and i will try to explain.

At beginning i load only 30 rows and when i scroll it makes a new request to the db and load other 30 rows (from 31 to 60).

Before it makes a new request, the subgrid works correctly, but after a i use the scroll i have this problem:

when i try to expand one of the first 30 rows (for example the row 20) it expand the subgrid and collapse!

Using the debugger, i have seen that jquery see two clicks, like as i click on two differents list , infact the guid associated at the events are, for example, 70 and 100.

I think that when i use the scroll and receive other 30 rows by the db, jquery see a new list.

Also, if i continue to scroll and it makes a new request to the db and receive other 30 rows (fro 61 to 90), i see that when i click on the row 20 it exanpe the subgrid, collapse and re-expand.

How can i fix this problem?

I hope that i'm clear.

I'm using only the option scroll and subgrid set to true, and the version of jqgri is 4.0.