def reloadGraphs(self) :
        "reloads the graph list"
        r = self.connection.session.get(self.graphsURL)
        data = r.json()
        if r.status_code == 200 :
            self.graphs = {}
            for graphData in data["graphs"] :
                try :
                    self.graphs[graphData["_key"]] = GR.getGraphClass(graphData["_key"])(self, graphData)
                except KeyError :
                    self.graphs[graphData["_key"]] = Graph(self, graphData)
        else :
            raise UpdateError(data["errorMessage"], data)
reloads the graph list