The Accordion control was developed by Ruurd Boeke, a member of the Silverlight team. He’s created a great set of guides on the control, I invite you to check them out:
- Part 1 – accordion
- Part 2 – accordion item
- Part 3 – expandable content control
- Part 4 – retemplating, real world example
- Part 5 – accordion button
To get the control, download and install the latest Silverlight Toolkit release. The Accordion control is available for both Silverlight 2 and Silverlight 3 development.