Hello Michael,
The provided Dojo example contains external script references that make it hard for debugging. Instead, I have prepared
an isolated example on the following Dojo, where you can find two cascading DropDownLists that are configured with MVVM, one of which is virtualized. Both of the widgets are initialized correctly and no JavaScript error is thrown when the cascading functionality is triggered.
I would suggest using this example as a starting point and develop it further according to the project requirements.
Regards,
Dimitar
Progress Telerik
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