Tk Ruby

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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