>You have lots of choices, and gets into theory of software Patterns (some good books available), one possiblity is setting the Form's KeyPreview = .t. then place code in the form's KeyPress event to toggle the "Apply" control's enabled property. Does this make sense? hope it helps!

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>I have a form containing several controls. One of them is an "Apply" button. This is initially disabled. I want a change in the settings in any of the other controls on the form to cause the button to be enabled. Is there any way to automate this (e.g. is a form property changed when any one of its contained objects is changed)?

Makes excellent sense. I'll give it a whirl!