Hello,

This is a Siliverlight control that is used internally in our Quince UX best practices application. It was developed internally by our Quince / Siliverlight team, although now that you ask about that, it might be a good idea to ship that separately if there is demand for it.

My suggestion is to ask this question in the Quince forums here:

http://forums.infragistics.com/forums/252.aspx

There that guys who developed it (and Quince) will respond much better than I can.

Hope this helps.