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.
Features include:
Unlimited number of hierarchy levels
Items can display images and text
Context buttons
Item headers can display custom controls
Item selection
Group expansion/collapse animation (one or multiple groups can be expanded simultaneously)