Run sample at https://dojo.telerik.com/@GaloisGirl/axacOhOC and click "New Folder".
Hello, Anna,
The reason for the experienced issue is the fact that the create endpoint is not defined:
https://dojo.telerik.com/aGovAZeJ/2
Also, make sure that the parameters in the success functions should are unique, and representing the newly created folder, in order to achieve the proper behavior of the component.
Regards,
Nencho
Progress Telerik