public class MinimalCustomAnnotation : Annotation
{
     public override Canvas CreateAppearanceCanvas()
     {
         Canvas myCanvas = new Canvas();

         // Create the annotation's appearance canvas here.
         // The canvas that this method returns will be displayed on screen.

         return myCanvas;
     }

     public static MinimalCustomAnnotation Create(AnnotationManager annotationManager)
     {
         return new MinimalAnnotation(annotationManager);
     }

     public MinimalCustomAnnotation(AnnotationManager annotationManager) : base(annotationManager)
     {

     }

     public MinimalCustomAnnotation()
     {

     }
}