Thank you Chris. Excuse my poor english knowledge.
The correct answer to my question is probably "Hard Core Reference".
I use a PictureButton control, allways enabled, but the assigned picture to the control, shows the "disabled/enabled state", depending on the user click (and other conditions).
I can't assign two pictures, for the enabled and disabled states, because the user would not have access, to enables it.
At this moment I understand, I can't do it with a PictureButton Control; I must change my design,for example, using two controls: a CheckBox and a Picture.
Anyway, I think, my original design was a good idea, with PB limitations. What do you think?
Augusto