implement equals in entityproxy

[FrugoFrog]

Hi there

I have 2 CellLists with EntityProxies. I want to add a selected item
from one only if it is not present in the other.
Is there a better way to do this than:
a) creating a wrapper object implementing equals and using list.contains
b) comparing all selected elements to each element in the other
list(for example database id filed)?

cheers