Obvious bug correction

dockingcore/src/main/java/fr/soleil/docking/perspective/PerspectiveFactory.java

@@ -67,7 +67,7 @@ public class PerspectiveFactory implements IPerspectiveFactory {
     public boolean add(IPerspective e) {
         boolean result = perspectives.add(e);
         if (result) {
-            support.fireIndexedPropertyChange(PERSPECTIVES, perspectives.indexOf(result), null, result);
+            support.fireIndexedPropertyChange(PERSPECTIVES, perspectives.indexOf(e), null, result);
         }
 
         return result;