A RadioGroup inside a Grid EditorTemplate will fire OnBlur when the user clicks on it. This will close the edit cell and (usually) not apply the new value.

Here is a test page: https://blazorrepl.telerik.com/wvbmkMvd48rpMN4547

Currently, the only available option is to use the Enabled parameter to create a similar behavior to read-only, but from an accessibility point of view, the end-user can't interact with the component and can't go through all available radio options. Add Readonly parameter.