Rhino.Input.Custom.GetObject(): trigger event when new object is added to selection

@axa wrote:

Is there a way of triggering an event every time a new object is added to the selection?

I am trying to write a custom block picker that adds all instances of the block that the user has just picked to the selection, and print how many instances of the block it has found.

My code so far is largely based on this thread:

Thank you

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