How to disable the default selection of a radio button?

< ^ > P N |<>|^_>< --- | ~ ...Help

Hi all,

I use FXRuby to create  5 radio buttons and tie them to FXDataTarget.
When I run the codes a defautl button is always selected. Is it
possible to disable this feature so that no button is chosen at the
first run?

Thanks,

Li
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