First ASP.NET server control that creates Visual Studio style docking panels. Can auto-hide/slide-open/maxi mize/pin tabbed-panels. Panel groups for complex layout. Live refresh of contents while resizing. Constraints on sizes: min/max/step. Appearance customizable via CSS & Themes. Works with MS ASP.NET AJAX. Panel states persist across postbacks. Client API. Dynamic panel. Supports all major browsers, quirks/strict modes.