A Simplified Tk Reference

Keyword:	radiobutton
Description:	Just like checkbuttons but they can (and should) unselect other radiobuttons that share a common variable. Thus, the -variable option binds radiobuttons together. The -value button must be used in most cases or the radiobuttons will share a default value and get confused.
Example:	radiobutton .r1 -text "White" -value "white" -variable bread -anchor w radiobutton .r2 -text "Wheat" -value "wheat" -variable bread -anchor w radiobutton .r3 -text "Sourdough" -value "sour" -variable bread -anchor w pack .r1 .r2 .r3 -fill x

Official Syntax:	http://www.scriptics.com/man/tcl8.4/TkCmd/radiobutton.htm

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Chris X. Edwards ~ January 2004