public override void CreateEditControls() { var imageSlideCollectionControl = Page.LoadControl(VirtualPaths.SlideShowEditModeControl); _editPropertyImageSlideCollectionControl = (IPropertyImageSlideCollectionView)imageSlideCollectionControl; _editPropertyImageSlideCollectionControl.InitialImageSlideShow = JsonConvert.SerializeObject(ImageSlideShow, new IsoDateTimeConverter()); Controls.Add(imageSlideCollectionControl); _editPropertyImageSlideCollectionControl.InitialImageSlideShow = JsonConvert.SerializeObject(ImageSlideShow, new IsoDateTimeConverter()); }