Scaling a GUITexture using iTween

I am trying to scale a GUITexture image to become smaller over a given period of time. I have been able to move them around the screen, and fade them in and out using the appropriate functions. However, using the same methods as I used before, the GUITexture does not get smaller over the given time period. Is there a way that I can do this?

Thanks

There's a scaling GUITexture in the second half of the "Animating 2D" example. Have you checked there?