Hi Brian,
The linked thread discusses that customizing the filter of a boolean column is not supported. Currently, the filter template function will be executed by the Grid but it is still not possible to replace the radio buttons with a DropDownList out of the box because the DropDownList has a text input at its base and the values in it will be strings.
There is a way to replace the string values with boolean ones at runtime, during the
filter event, so with some customization, your requirement of showing a DropDownList should be achievable:
Then, on filter of the Grid, convert the values as needed:
Regards,
Tsvetina
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