Hi John,
>I have two forms defined from classes:
>
>The oFirstWindow form has:
>AutoCenter=.T.
>caption=''
>closable=.F.
>controlbox=.F.
>maxbutton=.F.
>minbutton=.F.
>movable=.F.
>
>The oSecondWindow form has:
>AutoCenter=.F.
>caption=''
>closable=.T.
>controlbox=.F.
>maxbutton=.T.
>minbutton=.T.
>movable=.T.
>
>When I oSecondWindow.show the close button is disabled.
>Why?

Because the controlbox property is set to .F.

>Also, what's the difference between show and show() ?

That makes me recall a discussion about functions, procedures and
methods a few weeks ago here in the UT :)

You don't have to worry about that as long as u don't have
to send any parameter to it.