fix flow drawing in geo layout
diff --git a/web/ons-demo/js/rings.js b/web/ons-demo/js/rings.js
index 29907f6..979d28b 100644
--- a/web/ons-demo/js/rings.js
+++ b/web/ons-demo/js/rings.js
@@ -13,6 +13,11 @@
topology = svg.append('svg:svg').attr('id', 'viewBox').attr('viewBox', '0 0 1000 1000').attr('preserveAspectRatio', 'none').
attr('id', 'viewbox').append('svg:g').attr('id', 'topology').attr('transform', 'translate(500 500)');
+ flowLayer = d3.select('svg');
+
+ // hack to make the shared flow drawing code work
+ drawingRings = true;
+
cb();
}