DevExpress engineers feature-complete Presentation Controls, IDE Productivity Tools, Business Application Frameworks, and Reporting Systems for Visual Studio.
WinForms Accordion Control
The Accordion Control allows you to create a full-featured navigation bar with multiple items (actions). Items can be combined into groups. Groups can contain nested groups so you can create an advanced hierarchical navigation menu.
Unlimited number of hierarchy levels
Items can display images and text
Item headers can display custom controls
Group expansion/collapse animation (one or multiple groups can be expanded simultaneously)