Hello Richard Grimmer,
Sorry for that, i just don't get the exact meaning of re-minifying.
However I've just tried minifying exactly the same thing and created simple example project showing few RadioButtons. (the reflector also says that the RadRadioButton is present in the Controls.dll)
Can you check the attached example and the minified assemblies as well.
It is also possible to run into VS issue - is it possible to cache your first version of the assemblies without RadioButton, and now it can't realize that the ref. assemblies are different, thus using the old ones from it's cache (it often do this). You can try Cleaning a couple of times, deleting bin/obj folders and it this doesn't help, you can paste the assemblies in another folder and reference from there.
Please let me know if this solve the problem.
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