Coloradjust class creates some gadgets that allow adjusting a single color. Depending on the operating system, different kinds of gadgets are be used. Kickstart 2.x users might only receive an RGB slider triple, Kickstart 3.x users could get an additional colorwheel if available. However, the outfit of this class is not important for you as a programmer.
Here is an example XML excerpt for creating a coloradjust gadget set to all white: