>I vaguely recall I was having similar problems long ago with textbox inside the grid in VFP6.

Hi,
No grid involved here. Fabio's last suggestion fixed it - but I've no idea why :-{
Best,
Viv

>
>
>>Hi,
>>
>>What can cause the above error when setting a property of an object?
>>
>>I have a class derived from 'Container' with a property named 'IsValid' with an access method that simply returns T.
>>A second class is derived from this which overrides the IsValid_Access by returning 'This.IsValid'
>>
>>In the InteractiveChange of a textbox in the class I have:
>>

WITH THIS.Parent   &&(i.e the class instance)
>>  .IsValid = .T.
>>ENDWITH

The .IsValid=.T. line raises the 1734 error. If I suspend before the line executes the debugger shows the correct value for .IsValid
>>
>>I don't see why the accessor code I've mentioned would be relevant since the line is question is assigning rather than accessing the property value but thought I'd mention it.
>>This is old code and ,AFAIK, worked OK in the past and no code changes have been made although it''s possible that the environment settings have changed (but I can't think of one that would affect this?)
>>
>>Maybe this is something simple and I've just been away from VFP for too long?
>>Regards,
>>Viv