>>>Also you can check if
>>>
>>>TYPE("thisform.myobject")= "O"
>>>
>>>and check for !ISNULL(thisform.myobject)
>>
>>I can see the need to check ISNULL() for an object variable pointing to an object that may have been destroyed. But how would THISFORM.myobject become .NULL. if it existed?
>
>It may look excessive, and probably it is, but truly speaking thisform.myobject syntax by mistake may point to the form property which contained the object reference and was reset to .NULL.
>Theoretical scenario: It is possible to remove the form object, then add the property with the same name, assign object to it and reset property to .NULL.
>
>Now you have
>
>TYPE("_screen.activeform.text1") = "O"
>and _screen.activeform.text1 equals to .NULL.
>
>Voila! :)
>
>Oh, well, that may be an overkill... :)

I'd say it is overkill. You could just as easily add the property with the same name, set it to a wrong object, and not set it to .NULL. and the test would still come out wrong. These both seem like rare, equally likely "hostile cases".