This demo shows how it is possible to build a dynamic GRID by
simply leveraging a Lightstreamer DynaGrid.
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
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 Subscription contains
one item only (i.e. each row on the screen is a subscription), so that
the granularity of subscriptions and unsubscriptions is at a row level.