如何取消磁贴的翻转？

Question

我做了各款应用，主磁贴是会翻转的，但我在设置中加了个“是否翻转磁贴”的设置，可以取消磁贴的翻转，

翻转的磁贴前后都是图片：

var tile = Microsoft.Phone.Shell.ShellTile.ActiveTiles.First();
                if (tile != null)
                {
                    var tileData = new Microsoft.Phone.Shell.FlipTileData()
                    {
                        Title = "中国联通",
                        SmallBackgroundImage = new Uri("isostore:/Shared/ShellContent/FlipCycleTileSmall.jpg"),
                        BackgroundImage = new Uri("isostore:/Shared/ShellContent/FlipCycleTileMedium.jpg"),
                        BackBackgroundImage = new Uri("isostore:/Shared/ShellContent/FlipCycleTileMediumBack.jpg"),
                        WideBackgroundImage = new Uri("isostore:/Shared/ShellContent/FlipCycleTileLarge.jpg"),
                    };
                    tile.Update(tileData);
                }

但是取消翻转如何设置BackBackgroundImage 属性？？

var tile = Microsoft.Phone.Shell.ShellTile.ActiveTiles.First();
                if (tile != null)
                {
                    var tileData = new Microsoft.Phone.Shell.FlipTileData()
                    {
                        Title = "联通助理",
                        SmallBackgroundImage = new Uri("Assets/Tiles/FlipCycleTileSmall.png", UriKind.Relative),
                        BackgroundImage = new Uri("Assets/Tiles/FlipCycleTileMedium.png", UriKind.Relative),
                        BackBackgroundImage = ？// 如何设置这个属性，使其不再翻转，设置为null，还会翻转，
                        WideBackgroundImage = new Uri("Assets/Tiles/FlipCycleTileLarge.png", UriKind.Relative),
                    };
                    tile.Update(tileData);
                }

Answer 1

试试用StandardTileData

Answer 2

设置BackBackgroundImage为一个不存在的url即可，