Method Unbind doesn't clear the subscription cache (objectSubs)

[vlkam]

Solution :

Add to RemoveMemberChangeAction method this line objectSubs.Remove(key);

` internal static void RemoveMemberChangeAction(MemberChangeAction sub)
{
var key = Tuple.Create(sub.Target, sub.Member);
MemberActions subs;
if (objectSubs.TryGetValue(key, out subs))
{
// Debug.WriteLine ("REMOVE CHANGE ACTION " + sub.Target + " " + sub.Member);
subs.RemoveAction(sub);

            objectSubs.Remove(key);
        }
    }`