Thank you for your feedback. I tried and was able to reproduce your issue.
The "'Only if necessary" option means that "this" qualifier will be added only if the member identifier equals the identifier of the parameter identifier.
So "this" qualifier should not be added in your case where you have "_i" as a field identifier and "i" as a parameter one.
We fixed this issue and the fix will be included in our next internal build.
Thank you for your help!
the Telerik team
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