In order to assist you further on this by anyone, try to state the reason why you want to addproperty and delete it somewhere at runtime?

>>Not a good idea, adding properties to the _Screen. You'd be better off using an application object for that (just a global object variable).
>>
>>>
>>>Hi Nigel,
>>>Thanks.
>>>But i add a property to _screen object.
>>>And the _screen object destroys only when quiting the vfp.
>>>Thanks.
>>>Cemal.
>
>Your are right.
>But when i create a application object for holding my propertys i cant remove
>it too.
>And when i cant remove this object i cant remove the property.
>Its same with using _screen for holding my propertys.
>Thanks