subform Disappears

[Ashutosh]

Hi

I have a form say A which has a subform A_sub. Now there
is another sub form in A_sub say A_sub_2.
Now on the subform A_sub there are two fields which are
drop down lists.
Now whenever i go and select the values from any of the
drop downs twice ( i select a value from the list and
suppose i found out that it is the worng one and want to
select some other value from the list) then the subform
A_sub_sub disappears and does not show up

I could not figure out why. I tried writing requery in the
after update and before update event on the drop down
list but of no use.

Thanks

Regards
Ashutosh