In order to add a property, content entry is used. First the action class is marked as being a content entry class by adding a ClassOverview attribute to the class:

    [ClassOverview]
    public class HowToAction : Action
        

After this is done, add a property to the class. In this case we will add a new string attribute called "Message", which represents message that will be sent in the email. To see more about marking up a class for content entry, see how to mark up classes. This looks like:

    private string message;
    /// <summary>
    /// Message of the email
    /// </summary>
    [PropertyInformation(typeof(StringConverter), typeof(InputEntry), true, 0)]
    [PropertyLanguage(PropertyLanguage.English, "Message", 
        "This is the message of the email", "You must enter a message")]
    public string Message
    {
        get {return message;}
        set {message = value;}
    }