G'day goutham,
I provided you with a link to Tk::Radiobutton in the CB. Given you just immediately posted your code here, you clearly didn't read this documentation.
You have no -variable or -value options set. The documentation will tell you about those: I can't read it for you!
-- Ken
In reply to Re: All Radio Buttons selected by default?
by kcott
in thread All Radio Buttons selected by default?
by goutham
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