bugfixes: delete entries in larger docgroups, fix vcdemo

Change-Id: I76a09faafe79d0fd85efc32a8bcdec37878ba486
(cherry picked from commit 6885f6e34dd6ae2614713f86e5d28aea2ed832d8)
diff --git a/dev/js/src/vc/docgroup.js b/dev/js/src/vc/docgroup.js
index 10a6495..858e847 100644
--- a/dev/js/src/vc/docgroup.js
+++ b/dev/js/src/vc/docgroup.js
@@ -210,6 +210,9 @@
 
       group.appendChild(op.element());
 
+      var vcchevent = new CustomEvent('vcChange', {'detail':this});
+      document.dispatchEvent(vcchevent);
+      
       return this;
     },