A simple Grid Demo has been released online, that shows a dynamic GRID built on the top of Lightstreamer visual tables (OverwriteTables).

The 30 items of the Stock List Demo are virtually contained in the GRID, but only 5 at a time are displayed. The slider to the right (based on script.aculo.us) implements a virtual scroll bar. When the table is scrolled, the invisible items are unsubscribed from and the new visible items are subscribed to. To accomplish this, each Lightstreamer table (that is an OverwriteTable) contains one item only (i.e. each row on the screen is a Lightstreamer table), so that the granularity of subscriptions and unsubscriptions is at a row level.

The demo is accessible from http://app.lightstreamer.com/GridDemo/index.html.