Added EventListener to vc-Element instead to document

Change-Id: I2321f1b2180067b83a9e0579c13010586192de1b
diff --git a/dev/js/src/vc/docgroupref.js b/dev/js/src/vc/docgroupref.js
index f72e27a..9425fb3 100644
--- a/dev/js/src/vc/docgroupref.js
+++ b/dev/js/src/vc/docgroupref.js
@@ -111,7 +111,7 @@
       };  
      
       var vcchevent = new CustomEvent('vcChange', {'detail':this});
-      document.dispatchEvent(vcchevent);
+      KorAP.vc.element().dispatchEvent(vcchevent);
       
       return this.element();
     },