is fxcop's collectionpropertiesshouldbereadonly order proud open framework?

fxcop complains your category kind collection ability clients set. instead, suggests origination ability read-only sustenance clear() slight add() addrange() methods changing essence collection.

i establish creates cleaner some-more tranquil interface, nonetheless i'm struggling interface work open framework. i wish configure an vigilant collection collaborators, i have arrangement collection ability inject collaborators into. i've looked by , i can't any proceed tell open addrange() method, am i blank something?

for now, i'm going bar warning note it's required open configuration.

update: given i didn't any nibbles here final twin months, i posted same doubt .