TreeView is randomly failing to show newly added nodes?

Refresh only redraws the Client area, while Invalidate redraws the entire control. It's just a shot in the dark... I've never encountered this problem before.

You should only add it to the tree in case its parentID is empty (or null or 0 depending on its type). In Addition, add the EnsureVisible method to your newly added node, and remove the cloning.

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