I am not sure that I fully understand your custom scenario. Could you please elaborate more on your current implementation? Are you using the NodeViewModelBase class in a GraphSource in your application?
Also, it would be helpful if you clarify what you need to paste (string, image...) and where you need to paste it from. Are you using the serialization feature of the RadDiagram
? What you have in mind when you say "valid Telerik diagram items"? Do you have any validation of the items or you need to visualize RadDiagramShapes with the pasted string set as content?
Pavel R. Pavlov
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