I really like a certain Silverlight feature that I've seen in a couple of sites. I would like to know what this "concept(s)" is/are so I can do more research and implemented it on my own. If you see the attached image, I like those expandable sections, reference (1) and (2) sections. They are circled in red and the features that I like are green and expandable.
For a live demo: http://demos.telerik.com/silverlight/#DataPager/FirstLook
Thanks for any advice.