Thank you for drawing our attention to this issue. We investigated it further and found out that the problem is caused by a lost of the ObservableArray reference. We will address this limitation in the next internal build of Kendo UI. You can review the opened issue here.
As a gratitude for your involvement I updated your Telerik points.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI now!