I think folks have taken pictures of that icon and made calculated container fields that show it in different states to match what is going on in their databases, but I don't have an example of that available. As far as actually gathering the next 25 records, it sounds like you'd need to be storing find requests if you do this in a List. If you do it in a portal, however, you can have all the potential IDs is one relationship and then set groups of 25 IDs into a text key governing the relationship for your portal.
For help gathering these IDs in groups of 25, look at the
AppendNth custom function which could be called like this...
AppendNth ( Your::IDfield ; 26 ; 25 )
...to get the IDs for records 26 through 50.