Collapsible controls in MFC (example included)

In the WindowsXP Control panel, you can see a nice collapsible panel control on the left:

_{(sourc开发者_JAVA技巧e: leeindy.com)}

These are not just collapsible, but animated too. I wondered if these are any kind of control accessible to a developer, specifically in MFC? Or are they custom/bespoke functionality?

If you have Visual Studio 2008 with the MFC Feature Pack, have a look at the CMFCTasksPane class. The Feature Pack includes a TaskPane sample application that demonstrates how to use this.