def keep_in_front(self, *args):
for obj in args:<EOL><INDENT>self.objects_to_stay_in_front.append(obj)<EOL><DEDENT>
Pass one or multiples object that must stay in front.

        The ordering matters, the last one is put on top.

        Parameters
        ----------
        *args :
            Variable length argument list. Any folium object that counts as an
            overlay. For example FeatureGroup or a vector object such as Marker.