Clone WPF User Control

ExtensionMethods_XamlClone.cs

public static class ExtensionMethods
{
    public static T XamlClone<T>(this T original) where T : class
    {
        if (original == null)
            return null;
        object clone;
        using (var stream = new MemoryStream())
        {
            XamlWriter.Save(original, stream);
            stream.Seek(0, SeekOrigin.Begin);
            clone = XamlReader.Load(stream);
        }
        if (clone is T)
            return (T)clone;
        else
            return null;
     }
}