Hi all,
I have a custom UI control with a collection property that I can edit with a
CollectionEditor at design-time.

To achieve this I've used the Editor attribute (from System.ComponentModel)
on the collection property and created a class that derives from
CollectionEditor and overrides some methods. To keep it simple the type of
items the collection contains are objects with a single string property
called Name.

I'm looking for a way to validate new added items in CollectionEditor to
make sure that they all have a unique Name in the collection.

So far I've tried overriding CreateInstance() and SetItems() methods, but
haven't been able to enforce unique names.

Any ideas?

Thanks in advance.