Hi Peter,
Okay, I have no problem, but it is doable, right ?
I’ll have to:
1- create a custom filter.
2- loop on ALL the cells (main & nested) and evaluate this filter with each.
3- keep track of the results and their relations with each other.
4- update the grid’s source again.
But wouldn’t that affect the performance ?!! I think it will be killed 
Taking into consideration that normally now I already have a performance issue on updating the grid it takes about 6 – 8 seconds 
Thanks in advance.
Regards,
Bassant