>>>>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?
>
>
>I would be surprised if it were a bug - you're probably returning the wrong value from the When event

I return either .t. or .f.

Here is the code (and I just moved it to MouseDown with the same effect).

LPARAMETERS nButton, nShift, nXCoord, nYCoord
this.AddProperty('lOkToProceed',.t.) 
IF thisform.lMadeChanges and thisform.AskToSave() = 2
   this.lOkToProceed = .f.
   NODEFAULT
ENDIF    

Had it in when (returning true/false with no nodefault) - same effect.