>>I would like all my forms have not min a max button
>>
>>Which class of VFP do I have the change ?
>
>Change your base form class on which all your forms are based (assuming you have one).

And I think a bunch of answers to questions like thes can be found at http://fox.wikis.com/wc.dll?Wiki~VisualFoxProFAQs (actually not there, but on one of the FAQ lists it points to).