If you're sure oApp object exist, you can you more quick way that 'type' function:
IF PEMSTATUS(oapp,'otoolbar',5)
oapp.otoolbar.cmdedit.enabled=.f.
ENDIF
(suggested that you need to ckeck for toolbar, not a button that is part of toolbar).

>I need to do the following:
>I have a form that has a toolbar associated but I will like to disable a button of the toolbar based on certain conditions, i have the code in the refresh of the form, the problem is that when the form is created the toolbar still does not exists so if i do
>
>oapp.otoolbar.cmdedit.enabled=.f. and error occurs
>how can I check that the object exists before attempting this.?
>
>Thanks all
>
>Norman Avila