Hi Antonio,

>Can I assign a method to be executed when the user closes a form by clicking Window´s close control box on the upper right hand corner, or can I assign this button the same click method of the form´s CANCEL button ? Do I explain myself ?

If you put your code in the destroy event, and in your command button put : thisform.release(), your code in the destroy event will be called if you close the form with the 'X' up in the corner or if you click your command button.