public partial class CommentReplyCell : UITableViewCell, ISupportDynamicHeight

    {        public static readonly UINib Nib = UINib.FromName("CommentReplyCell", NSBundle.MainBundle);
        public static readonly NSString Key = new NSString("CommentReplyCell");

...
...

        #region ISupportDynamicHeight Members

        public void WillDisplay(ITableViewController viewController, object item)
        {
            AppSimpleUserReply userReply = item as AppSimpleUserReply;
            if (userReply != null)
            {
                if (userReply.IsBanned)
                {
                    TitleLabel.Frame = new CGRect(ReplierImageView.Frame.Right + 4, BanIconView.Frame.Bottom + 6, Bounds.Width - ReplierImageView.Frame.Right - 8, 1);
                }
                else
                {
                    TitleLabel.Frame = new CGRect(ReplierImageView.Frame.Right + 4, CreatedDateLabel.Frame.Bottom + 6, Bounds.Width - ReplierImageView.Frame.Right - 8, 1);
                }
                TitleLabel.SizeToFit();

                // Attachment Position
                switch (userReply.AttachmentType)
                {
                    case 0:
                        break;
                    case 1:
                        AttachmentImageView.Frame = new CGRect(ReplierImageView.Frame.Right + 4, TitleLabel.Frame.Bottom + 4, 96, 96);
                        break;
                    case 2:
                        break;
                    case 3:
                        break;
                }
            }
        }

        public float GetHeight(ITableViewController viewController, object item)
        {
            AppSimpleUserReply userReply = item as AppSimpleUserReply;
            if (userReply != null)
            {
                var leftHeight = ReplierImageView.Frame.Bottom + 8;
                var rightHeight = CreatedDateLabel.Frame.Bottom;
                if (userReply.IsBanned)
                {
                    rightHeight += 4;
                    rightHeight += BanIconView.Bounds.Height;
                    rightHeight += 6;
                }
                else
                {
                    rightHeight += 6;
                }
                rightHeight += TitleLabel.SizeThatFits(new CGSize(TitleLabel.PreferredMaxLayoutWidth, 1)).Height;

                // Attachment position
                switch (userReply.AttachmentType)
                {
                    case 0:
                        break;
                    case 1:
                        rightHeight += 4;
                        rightHeight += AttachmentImageView.Bounds.Height;
                        break;
                    case 2:
                        break;
                    case 3:
                        break;
                }
                rightHeight += 8;
                return (float) Math.Max(leftHeight, rightHeight);
            }
            return 0;
        }

        #endregion
}

Is there any problems? I tested code on my iPhone, the cell layout and height is OK. The only issue is data incremental loading.