Jim,

I'm glad that you solved your problem but I still baffled why it didn't work in the first place.

>I forget, Sergey, but the problem is SOLVED!!!
>
>MSKB #Q195533 describes a situation of the same error message with a COM object and suggested a workaround.
>
>Using that I coded:

Local xq
>xq = This.TypeSelector.OBJECT
>xq.Enabled = .T.
>xq = NULL

>
>and the error message stopped and I can now enable the treeview.
>
>Thanks for your help.
>
>>Jim,
>>
>>If you suspend execution at the time of error does

ThisForm.TypeSelector.OBJECT.Enabled = .T.

works from command window or errors out?
>>
>>>I don't see a mis-type... I copied the disable statement to under the enable statement and they both are identical except the other side of the equal sign.
>>>
>>>I first had it coded under a "WITH ThisForm" and got the error trying to enable then too.
>>>
>>>I too have no problem with both those statements in a 'simple' form, but the error is consistent in THIS damned form#@$!#@$!%@$