How to put reticule to a weapon? ImageStatic not work

[i7strelok]

Hi, I need a reticle for my weapon, I can do it with ImageStatic? I was reading and seeing these examples:

http://cegui.org.uk/wiki/Sample_code_for_all_Widgets#StaticImage

But, when I copy the code does not recognize me ImageStatic.

Here is an example of what I want to accomplish: http://www.juegomaniac.com/juegos/imagenes/entrenamientofrancotiradores.jpg