'Construct a Ttk Combobox widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
exportselection, justify, height, postcommand, state,
textvariable, values, width'

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

    Entry.__init__(self, master, 'ttk::combobox', **kw)
