Make sure we raise the proper external event when clicking on elements

static/js/graphing.js

@@ -1422,7 +1422,14 @@ LogUsageChart.prototype.handleElementClicked_ = function(e) {
     disabled.push(this.data_[i].key != key);
   }
 
+  var allowed = {};
+  allowed[kind] = true;
+
   this.chart_.dispatch.changeState({ 'disabled': disabled });
+  $(this).trigger({
+    'type': 'filteringChanged',
+    'allowed': allowed
+  });
 };