>>>Hi everybody,
>>>
>>>I added NODEFAULT and return in Checkbox Click event, but it still changes the value.
>>>
>>>How can I prevent it?
>>>
>>>Thanks in advance.
>>
>>Set it to ReadOnly or Enabled = false
>
>No one with good suggestions of resolving the problem? It's probably a bug - but I'm not sure what workaround options are?

Haven't read the entire thread but how about..............

Putting the Click code in When and returning FALSE