Javafx hidden textbox by css on toogle button action

hi,

I ve a problem to check if a a field is enabled or disabled in a special case of javafx elements.

On the screen shot, you can see a part of object browser of my problem : i have a toogle button which active or déactive the fields.
Not pressed, first field is enable the second not. Pressed, the first field is not active the second is enable.

Despite all availables attributs (visible, disabled, editable, and others) i can't check the difference of both fields.
When i talk of this problem, one of my develloper told me about a hidden field by CSS...

My question : How can i catch css attributs on this case

thx u

Fabrice