// _entity might be null, in which case we have to make an empty model.
if (_entity == null) {
_createBlankEntity();
}
ActorGraphModel graphModel = new ActorGraphModel(_entity);
GraphPane graphPane = new GraphPane(controller, graphModel);
_graph = new JGraph(graphPane);
// If the model has a recorded size, use it.
List size = _entity.attributeList(SizeAttribute.class);