New Post: PropertyGrid Collection Editor - Class types for new objects

I want to thank you so much for your help. Everything is working fine now.

I have just one more question please. In the Collection Control, I need to be notified when a new object is added cause there are some fields to be automatically filled.

how to get notifications when a new object is added or deleted before the dialog is closed.

Also when the dialog is closed can I get notification.

Here are I talking about properties that contains a field as a list and I am using the default Collection control.

thanks