'Construct a Ttk Radiobutton with parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, value, variable'

def __init__(self, master=None, **kw):

    Widget.__init__(self, master, 'ttk::radiobutton', kw)
