Can anyone suggest a name for this control?
It's designed to display nested hierarchical data, in the same manner as a TreeView control. However, unlike a tree, it can only expand one "branch" at a time - in the bottom half of the control. The top half contains a list of all of the parent items - the user can navigate to any level by clicking on the appropriate parent item.
I first came across this type of control on Betfair.com (which is also where the data for this demo application came from). It is used to navigate through the various betting markets available.
For want of something better, I've called it a StackView control, but there must be a more common term for this sort of display.
Edit: I've re-done the image for those people who don't get the hierarchical nature of this data.