'Invoke the specified L{methodName} method of the C{original} attribute
for proxyForInterface.
@param oself: an instance of a L{proxyForInterface} object.
@return: the result of the underlying method.'

def __call__(self, oself, *args, **kw):

    original = getattr(oself, self.originalAttribute)
    actualMethod = getattr(original, self.methodName)
    return actualMethod(*args, **kw)
