Work around change in handler behaviour in OpenLayers 2.10

We need to install the endDrag routine as the "done" handler after
creating the control otherwise the control will overwrite our handler
with one of it's own.

app/views/browse/start.rjs

@@ -25,10 +25,10 @@ page << <<EOJ
         sides: 4,
         snapAngle: 90,
         irregular: true,
-        persist: true,
-        callbacks: { done: endDrag }
+        persist: true
       }
     });
+    browseBoxControl.handler.callbacks.done = endDrag;
     map.addControl(browseBoxControl);
 
     map.events.register("moveend", map, showData);