partial void AddButtonClickHandler(NSObject sender)
        {
            // Create a random dummy image.
            var rect = new Random().Next(0, 2) == 0 ?
                       new CGRect(0f, 0f, 400f, 300f) : new CGRect(0f, 0f, 300f, 400f);

            UIGraphics.BeginImageContextWithOptions(rect.Size, false, 1f);
            UIColor.FromHSBA(new Random().Next(0, 100) / 100f, 1f, 1f, 1f).SetFill();
            UIGraphics.RectFillUsingBlendMode(rect, CGBlendMode.Normal);
            UIImage image = UIGraphics.GetImageFromCurrentImageContext();

            UIGraphics.EndImageContext();

            // Add it to the photo library
            PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() => {
                PHAssetChangeRequest assetChangeRequest = PHAssetChangeRequest.FromImage(image);

                if (AssetCollection != null)
                {
                    PHAssetCollectionChangeRequest assetCollectionChangeRequest = PHAssetCollectionChangeRequest.ChangeRequest(AssetCollection);
                    assetCollectionChangeRequest.AddAssets(new PHObject[] {
                        assetChangeRequest.PlaceholderForCreatedAsset
                    });
                }
            }, (success, error) => {
                if (!success)
                {
                    Console.WriteLine(error.LocalizedDescription);
                }
            });
        }