Create child tabbed panels that dock to one of the 4 edges of the control

Multiple panels can be docked to the same edge

Panel can be autohidden, pinned, hidden or maximized

Create horizontally or vertically split child panels

Child panel size can be fixed or auto-stretch to fill remaining height/width of the control

Panel can be collapsed or hidden

Multiple child panels in a control

Control resizes with browser window or parent container Note 1

Multi-level nesting of different types of containers Note 1

DIVs based panels (no HTML framesets)

Max/min/step sizes

Draggable splitter bar for resizing panels

Oversized splitter thumb

Live refresh of panel content while dragging the splitter bar

Collapse/expand buttons on splitter bar

Control appearance highly customizable with CSS, control properties and ASP.NET 2.0 Theme

Persist various states (if applicable, e.g. panel state, splitter bar position, scrollbar position) across postback

Client-side JavaScript-based API

Client-side event notification

Server-side .NET API

Server-side event notification

Easy to create dynamic panels

MS ASP.NET AJAX support with customized UpdatePanels and panel state updates via AJAX

Excellent Visual Studio 2005/2008 design-time support

Support major browsers (see System Requirements)

Automatically handle different box-models, quirks/strict modes in different browsers. No more CSS hacks by developers.