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The normal way to solve this problem is to use validation (or errors as you put it). I would not advise mixing control types within a single field as it's overly complex and confusing to a user who knows what a checkbox and radiobutton are. From a Usability perspective you should aim to tell the user what the state of the system is. So if zero selected ...


I was faced with a slight variation of your problem sometimes ago. Here is a potential solution (modified for your use case) I came up with, please let me know if this can work.

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