The documention mentions a class that is not in the source code! Where is it?
First of all, check that the documentation or the examples you are looking at match the version of KWWidgets you downloaded. The KWWidgets API is automatically generated on a nightly basis: if the class does not show up in this document, then it is likely it was removed or renamed a short while ago. Be aware though that some classes listed in the API are not in the source code but are generated automatically from a set of templates; for more information, check the corresponding “Auto-Generated Classes” section in the online API.