Virtualization\LoadOnDemand

Hi guys,
I'm working with thousands of records and I would like to use some kind of virtualization. Is this possible?
I would like the grid to create the records on demand when I scroll down for example. Any ideas\suggestions?

Thanks.
GG

I just beginning with Ext4 but AFAIK there is, as in 3.x, two parameters telling the server which records to load: start and limit. Of course you have to tell to store how many record it has. Your server code must deal with those parameters, for example in a simple query in Firebird:

select first ? skip ? *
from ...

First SQL parameter is "limit" and second is "start"

Regards.