public ImageAttachmentZoomableView(Context context, ImageAttachmentViewModel viewModel) : base(context)
 {
     _helper = new MyImageAttachmentViewHelper(this, viewModel);
 }
 public ImageAttachmentThumbnailView(Context context, ImageAttachmentViewModel viewModel) : base(context)
 {
     ViewModel = viewModel;
     base.SetScaleType(ScaleType.CenterCrop);
     _helper = new MyImageAttachmentViewHelper(this, viewModel);
 }