Hi,
Thanks for providing the screenshot.
The sample application provided in our last post i.e; C1TreeViewUndoRedoSample.zip represents the procedure to perform clipboard operations on a C1TreeView. Hence, we request you to please follow the same sample application.
If issue still persists then please share the stripped down sample application representing the issue you are facing.
Furthermore, in a key/value pair the key must be unique and so, if you are pasting the copied item then you need to assign a new key to the newly pasted node.
Thanks,
Akshay