>>>Let say, some custom form property holds object reference, e.g. form contains pageframe and each page activate event fires:
>>>Thisform.ActivePageObject=This && surely, it's just an example, it can be buttons, textboxes etc , even exteranl objects
>>>Now, if you will not issue This.ActivePageObject=.NULL. in Form.Destroy event, you cannot release the form and close button is grayed out.
>>
>>Thanks, Ed. That's what I thought you were saying. I just haven't run into this one and wanted to be sure.
>
>This behavior only surfaces when the user clicks on the close button and a reference is outstanding. The button will not gray itself.

It will also gray out if some code fires
RELEASE WINDOW "formname"
unsuccessfully trying to close the form