I name my library document, however I am not able to determine what library a shape is dragged from. I keep getting null in my nodeinserted even.

I have something like that

myString = myShape.Library.Name;

however myShape is fine, but myShape.Library always null

I try to use the nDiagramElement, but not successful

so after inserting a shape, how can I determine what library that shape is dragged or inserted from