Observe async result

src/Microsoft.VisualStudio.ProjectSystem.Managed.VS/ProjectSystem/VS/PropertyPages/PropertyPage.cs

@@ -363,7 +363,7 @@ public void SetObjects(uint cObjects, object[] ppunk)
                 }
             }
 
-            OnSetObjects(false);
+            WaitForAsync(() => OnSetObjects(false));
         }
     }
 }