[C1Category("Behavior")]
[C1Description("C1Command.UserData", "Arbitrary data that can be associated with the command.")]
[TypeConverter(typeof(StringConverter))]
public object UserData { get; set; }

<C1Category("Behavior")>
<C1Description("C1Command.UserData", "Arbitrary data that can be associated with the command.")>
<TypeConverter(GetType(StringConverter))>
Public Property UserData As Object