This really is not a bug. This is a dangling object reference. This is the real problem why the form will not destroy. You can optionally put the THIS.oComm = .null. in the Destroy, and your form should release.

>Is this VFP bug ?
>I think that when form is closed, all objected referenced only from
>from properties are released automatically!
>
>>The form isn't being destroyed because of the oComm property needs to be released manually.
>>
>>Use the QueryUnload method of the form. This method is called when you click on the upper right corner button.
>>
>>

>>PROCEDURE QueryUnload
>>THIS.oComm = .null.
>>ENDPROC
>>

>>
>>>I create a comm object and event handler in form init()
>>>
>>>When the form is closed by clicking upper right corner, event handler Destroy()
>>>event does not fire. Why ?
>>>
>>>

>>>* Form Init()
>>>this.oComm = createobject( "mscommlib.MSComm" )
>>>EVENTHANDLER( this.oComm, NEWOBJECT("commevents", 'pump.prg' ) )
>>>

>>>
>>>
>>>* File pump.prg contains:
>>>

>>>DEFINE CLASS commevents AS custom
>>>IMPLEMENTS DMSCommEvents IN "mscommlib.MSComm"
>>>
>>>procedure Destroy
>>>* this event does not fire when form is closed. why ?
>>>ENDPROC
>>>
>>>PROCEDURE DMSCommEvents_OnComm() AS VOID;
>>>HELPSTRING "Occurs whenever the value of the CommEvent property changes."
>>>ENDPROC
>>>ENDDEFINE
>>>