When I wrote mygrid.enableBuffering(5) before initalization

When I wrote
mygrid.enableBuffering(5) before initalization of grid. I found that as soon as
I scrolled down to grid, it created a tree with my frist row and appended
remaining records in hierarchy. is it some bug or I can use enablebuffering
only with pro versoin?

enableBuffering settings are
used in case of paging of dynamic scrolling modes, those two modes incompatible
with TreeGrid and available only in default Grid view.