Problem with checkbox group

I've created a form that displays and hides some items depending on the answer of a radio button.
For some reason the hiding/showing of the checkbox group doesn't work (even the initial state, which is hidden doesn't hide them) and the checkboxes themselves are not displayed. What am I missing here? Name of the checkbox group has the nescessary []...
I've included a backup of the form.

Hello MteeBelgium,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
How can I have a 'select all' option in a checkbox group?
How do I build a select drop-down, radio button or checkbox group?
P.S: I'm just an automated service😉

Hi MteeBelgium,

First, the Event code uses the ID, not the Name so you should leave out the [] there.

Second, please use Show Parent / Hide Parent both in the Initial state and in the Events settings. That hides all of the element including the wrapping HTML and solves your problem with the invisible checkboxes.

Third, I recommend that you don't use 0 and 1 as the values for the radio box - 0, in particular can cause some problems. Use short strings instead like ja and niet.

Bob

Thx Bob, works like a charm now!