>>>Hi, all! Please answer which function can determinate does object (in my sample form) exists or not. Thank you. Andrew
>>
>>If you're checking on a object in a form, use the PEMSTATUS() function. If you want to know if a form exists, you can check the _SCREEN.FORMS collection.
>
>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?