Sort does not work in lazy loading datatable example

There appears to be a problem with the lazy loading data table example http://www.primefaces.org/labs/ui/datatableLazy.jsf
The sort (using links near column name) does not seem to work.

[optimus.prime]

I don't think you read the description;

Notice that lazy sorting is not implemented as showcase has no real datasource connection, just dummy data is returned as the sample implementation for demonstraton purposes.

You are right. Somehow i missed it.
Thank you