RadTreeMap supports notifications for collection and property changes on multiple levels. I have prepared for you a small demo application that simulates a file / folder scenarios with ability to add / remove / update items in it. Each file and folder is raising CollectionChanged and / or PropertyChanged in response to changes made to its properties.
Please evaluate it in your environment and check if it is working properly. If the problem with your scenario persist will it be possible for you to prepare a small runnable app that demonstrates the issue (or update the one I have attached) and send it to us for further investigation. This way we will be able to better understand what is going wrong.
All the best,
the Telerik team
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