I have already responded to you in the private support thread but I will paste my response here as well in case anyone else visits this thread:
The question that you have contacted us for seems to be a duplicate of the Open Edge case I found here:
It is our colleagues from Open Edge who should be able to guide you when it comes to integrating a Kendo UI widget in the Open Edge Kendo UI Builder environment.
The Kendo UI TreeList has the same requirements and support as the rest of the suite as listed here:https://docs.telerik.com/kendo-ui/intro/supporting/browser-supporthttps://docs.telerik.com/kendo-ui/intro/supporting/os-support
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