ExportPropertyEvent += new EventHandler<TransformPropertyEventArgs>(MyProperty.ExportEventHandler);

 public static void ExportEventHandler(object sender, TransformPropertyEventArgs e)
 {
    IPageTransferContext transferContext = sender as IPageTransferContext;
    if (transferContext == null     // The transfer context should not be null 
        || e == null                // The event args shuld exists  
        || e.IsHandled              // and not be handled by another handler
        || e.PropertySource == null // and the property type should be the correct type.
        || e.PropertySource.TypeName == null 
        || e.PropertySource.TypeName.CompareTo("Development.MyProperty") != 0)
    {
        return; 
    }

    //TODO: Write export transformation code for MyProperty

    e.IsHandled = true; // Signal that its handled to all other Export event handlers.
}