When checkbox1 is unchecked, should they also be automatically unchecked?
Yes that is correct.
When checkbox1 is unchecked, they should automatically become unchecked.
Then use this code:
this.getField("checkbox2").tickThisBox(0, (event.target.value != "Off"));
this.getField("checkbox3").tickThisBox(0, (event.target.value != "Off"));
You already have the code for this. On the other thread.
Thanks try67 for helping me out.
Thom just helped me realize what I was doing wrong on the other thread.