PersistenceManager manager = new PersistenceManager();
            manager.PropertyPersisting += (o, ea)=>
            {
                if (!string.IsNullOrEmpty(ea.Name))
                {
                    if (ea.Name.Contains("Dialog"))
                    {
                        ea.Cancel = true;
                    }
                }
            };

            IsolatedStorageProvider isoProvider = new IsolatedStorageProvider(manager);            
            isoProvider.SaveToStorage(PersistenceManager.GetStorageId(this.rtb));