Merge pull request #757 from pcAmerica/Fix_IReactiveObject_Change_Observables

Fix IReactive object change observables

Author: anaisbetts

ReactiveUI/ReactiveObject.cs

@@ -72,15 +72,15 @@ void IReactiveObject.RaisePropertyChanged(PropertyChangedEventArgs args)
         /// </summary>
         [IgnoreDataMember]
         public IObservable<IReactivePropertyChangedEventArgs<IReactiveObject>> Changing {
-            get { return this.getChangingObservable(); }
+            get { return ((IReactiveObject) this).getChangingObservable(); }
         }
 
         /// <summary>
         /// Represents an Observable that fires *after* a property has changed.
         /// </summary>
         [IgnoreDataMember]
         public IObservable<IReactivePropertyChangedEventArgs<IReactiveObject>> Changed {
-            get { return this.getChangedObservable(); }
+            get { return ((IReactiveObject) this).getChangedObservable(); }
         }
 
         /// <summary>