Class 'GridConfiguration' not found

I am very new to using the dhtmlxgrid, so I have been trying to use the online examples to get me going. I am trying to use the code from “Defining Grid Structure on Server Side,” but I am getting the error in the subject line. The code sample I am referring to is:
docs.dhtmlx.com/doku.php?id=dhtm … erver_side

It works until I add “$config = new GridConfiguration();”.

Is there a GridConfiguration.php class file that I am missing?

ok. Obviously, I should have looked around the Download section. I was missing some of the files in the “dhtmlxConnector by Platform” package.