How to create Grips


Grips are getting interesting I have found documentation how to transform them in a script as well as lots of other things about how to set up Grips for plugins especially Custom Shape Grips but the finaly how to create and attach custom shape grips to an object in Rhino without scripting or programming?

Can someone explain the concept (pseudo) how to create a parametric cube including Grips functionality?

Is there any training course in class about how to create plugins for rhino? I am very interested in.

This is no possible - sorry.

– Dale