copy a dynamicprops object by value

I've created a class that is a subclass of dynamicprops,

   classdef myclass < dynamicprops

When I create an instance of this

   c = myclass

and then copy this

   d = c

then d and c refer to the same underlying object. Therefore, whenever I change a property of c, the corresponding property of d changes as well (because c and d really refer to the same thing).

Question 1. How can I make a "real" independent copy of c?

Question 2. Alternatively, can I adapt the class definition so that it will be copied "by value" and not "by reference" ?

Thanks for your help.

[Fernando]

I wish somebody would answer this.