Hi Georgi,
Thank you for replying.
Unfortunately duplicating child records does not help on my situation. I may not explained my issue clearly. I created a demo here:
https://dojo.telerik.com/IZoSimav
Pls not there are two records of {id: 60, Name: "Akeem Carr"}, while with different parent ids. No matter what the parent id of the second record is, those two records will both be placed under the parent node with 1st parent id. In the example they are both under {id: 11, Name: "Hyacinth Hood"}. And the actual parent of second child, {id: 42, Name: "Gage Daniels"}, has the expander icon but with no child attached. We observed same behavior in our project.
Could you suggest more?