You mean the docking windows? If so, check out following free control:
http://www.divil.co.uk/net/controls/dockingsuite/
This set of controls allows you to quickly and easily set up an interface
similar to that of Visual Studio .NET where tool windows are docked to the
sides of the main client area. Multiple panels can be docked to any side of
the form, and multiple controls can occupy the same space on the panel,
selectable with tabs. Advanced layouts can be achieved with panels and
controls being draggable to any other space in the docked configuration.
Full design-time support is included, and no coding is necessary to
configure an advanced window layout. There is no separate editor; windows
are laid out visually at design time just like they are at run time. Every
docked configuration achievable at runtime is just as easy to set up at
design time.
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Greetz
Jan Tielens
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Read my weblog:
http://weblogs.asp.net/jan