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>4) Show inheritance. I think the color and font change are most dramatic, but also show one thing more substantial.
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4b) Add a method to your form class, and show that all the forms now have it. Do anything with it, like just add the instantiation time to the caption. Show it works in any form. Paint all of the date fields yellow. Then ask them to do that in VB, and strain hard to keep your face from displaying the evil grin :>.