public void Remove(NoResetObservablecollection <T> items)
{
foreach (T item in items)
{
Add(item);
}
}
public void RemoveSlave(NoResetObservablecollection <T> items)
{
Remove(items);
items.CollectionChanged -= new System.Collections.Specialized.NotifyCollectionChangedEventHandler(SlaveItems_CollectionChanged);
}