feature was introduced in the latest R2 2017 release. After I updated the version with the new one - 2017.2.504
the example started working without problems:
Regarding the fact that the older Kendo UI version is loaded in the documentation dojo examples I have already forwarded it to the responsible team and it will be fixed right away.As a small token of gratitude I have updated your Telerik points.
Telerik by Progress