Hi Fred

>>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 code in the QueryUnload method, you can stop the form form exiting if need be by executing a NODEFAULT.

This is true for the X button but for a command button you will always have to remeber:

If thisform.quesryunload()
  thisform.release()
endif