Hi Andreas,
If I understand your scenario correctly you want to change the root folder of the RadFileExplore with an AJAX call. To ensure that the new folder will be populated in the in the TreeView you need to clear collection previous loaded folder before setting the new ViewPaths, e.g.:
If this is not the case could you please describe in more details what exactly you are trying to achieve? A sample page demonstrating the specific scenario will be of great help.
Best wishes,
Dobromir
the Telerik team
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