Full CSS Support
The appearance of each and every web control produced by Developer Express can be customized using CSS. This approach is the best choice if you need centralized control over the appearance of several controls or the entire site.
DevExpress ASP.NET controls fully support image sprites - all images (except for background and animated images) can be stored as a single image. Sprites are referred to by their position and size within the image. A single request for the specified canvas image is performed to obtain all necessary images, which significantly improves performance.
Additional performance benefits can be achieved by defining image sprite settings within a CSS file and by storing this CSS file as a compressed resource in a themes assembly. This approach is now used by default within all our web controls.
Help Topic: CSS Image Sprites Overview