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The RadioButton Widget

require 'Tk' top = TkRoot.new{title "Radio Button"}     radioVar=TkVariable.new     r1 = TkRadioButton.new(top){     text "Male"     variable radioVar     value 1 } r1.pack()     r2 = TkRadioButton.new(top){     text "Female"     variable radioVar     value 2 } r2.pack() Tk.mainloop