Virtualize a Kendo Dropdownlist with local datasource array of strings

[Lee]

I have a local array of between 2  and 2000+ strings that I would like to virtualize. For some reason, when I add the valueMapper to the virtual function when there are only 4 items in the array, it causes the user to not be able to click on anything.

 

Here is a dojo showing what I tried. You can click on a letter and nothing will happen.

https://dojo.telerik.com/oojEQyxf