How do I add a public event in uitypeeditor

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VB8

Dear Professionals,

Just one suggestion, can I add public event like "Add Button Clicked" with UITypeEditor. Or already some thing is available. Actually, I have an User control with is having an "Items" Property, I can add values to Items through StringCollectionEditor. I have propertyChanged method also. PropertyChanged method indicates that when an item is added first items property gets reset than item is added and kept on doing for all items.
I wanted to get notified when all items get added, some event like "AllItemsAdded()"

suggest if any
thanks
Kanoj

What I have tried:

I have not yet tried any thing so far if I get any suggestion, then I will try.