Hi Rob,this is by omission. Originally CollectionValueHolder didn't have it either until I've introduced ValueAdded/ValueRemoved. So feel free to incorporate it in a meaningful fashion to a DictionaryHolder.PeterOn Tue, Sep 12, 2017 at 3:46 AM, Rob Rothwell <r.j.rothwell@gmail.com> wrote:Hello,Unlike the CollectionValueHolder, the DictionaryValueHolder only notifies you that something has changed, rather than tell you what item has been added or removed.�� Does anyone know if this is by design, or just incomplete?If incomplete, what do you think about using the ValueAdded/ValueChanged/ValueRemoved announcements and passing the association in newValue/oldValue? Thank you,Rob