Skin
Skins give you total freedom in look and feel customization. A skin contains bitmaps showing all control elements in their various states (normal, hot-tracked, selected, pressed, etc.) Since each control is painted using the corresponding bitmaps, the appearance of the entire skinned application does not generally depend on the Operating System. By using skins you can introduce the Windows® XP look and feel options in applications that are not running under the XP OS.
With the ExpressSkins Library, you can add skin support to your applications built with Developer Express controls. Note that this library is not shipped as part of the Express Cross Platform Library and must be installed separately.