Access 2000 DAP – Disabling fields

I am trying to disable certain fields on my DAP. For example, if the approved checkbox is ticked the rest of the fields on the page are grayed out.

Also is it possible to gray out all the fields + the checkbox itself, so basically as soon as a record is approved it is maked read-only via the DAP.

Here is the code I am using to try to disable one field depending on if the checkbox is on or off.

This code does not work!!

What am I doing wrong?