>>>>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?
>
>How about

IF (ChangeNotAllowed)
>  this.Value = IIF(this.Value=0,1,0)
>ENDIF

in the Click event (g)

Right, but it doesn't sound like a very good interface as it will switch and then switch back.