Load data on visibility LongListSelector

I've noticed on certain list controls in WP7 that the lists will load data as the user scrolls to it. I don't know which control this is or if it's just a visual thing, but I'm curious if the data is actually loaded at the item is made visible.

I'm using a longlistselector with a lot of items in it, and if there is a way to selectively load the data in real time, I'd prefer that. Some examples I've seen are twitter and Zune Marketplace lists. Are these Pivots?

UX virtualization and data virtualization are 2 different things. The first sounds like what you are talking about and is implemented by default when you bind data to a ListBox.

UX virtualization is discussed here

Data virtualization occurs when data is lazy loaded as required and is discussed here.

The LongListSelector is an advanced ListBox so supports UX virtualization. It also supports data virtualization. An article discusses them both here.