Updates an existing plot with data corresponding
        to the key.

def update_frame(self, key, ranges=None, plot=None):
        """
        Updates an existing plot with data corresponding
        to the key.
        """
        element = self._get_frame(key)
        self._get_title_div(key, '12pt')

        # Cache frame object id to skip updating data if unchanged
        previous_id = self.handles.get('previous_id', None)
        current_id = element._plot_id
        self.handles['previous_id'] = current_id
        self.static_source = (self.dynamic and (current_id == previous_id))
        if (element is None or (not self.dynamic and self.static) or
            (self.streaming and self.streaming[0].data is self.current_frame.data
             and not self.streaming[0]._triggering) or self.static_source):
            return
        source = self.handles['source']
        style = self.lookup_options(element, 'style')[self.cyclic_index]
        data, _, style = self.get_data(element, ranges, style)
        columns = self._get_columns(element, data)
        self.handles['table'].columns = columns
        self._update_datasource(source, data)