Steve,

I don't know the full answer, but I've just experimented with this just now. If I type public override, I get Intellisense that shows overrideable methods *and* properties. However, all the properties that show up are base properties, none of my own. There must be some syntax that you can use in the base class when defining the properties that lets you know it's overrideable. But, I don't know what that is. I tried virtual and that didn't work (compile error).

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ignore the above about the base class. See my other reply instead.
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Keep looking I guess ...

~~Bonnie

>What is the syntax to use to extend a property in a derived class?
>
>Specifically, I want to execute some additional code in response to the setting of the Visible property on a control, and I want it encapsulated in the control class rather than being handled by a delegate on the form.
>
>I know that I can set up a handler for VisibleChanged, but I'm curious as to whether there is a way of overriding and extending the get/set code of the native property.
>
>Thanks.