>I know it is possible to set up a Combo-box with multiple columns...
>
>What I'm not sure about is how to set it up so that, as I change from one item to the next, I get a message (somewhere) that gives me ToolTip kind of information about the current item.
>
>For instance:
>The combo box may contain a list of services we provide....
>service-1
>service-2
>service-3
>service-4a
>service-4b
>service-4c
>service-5
>service-6a
>service-6b
>service-7
>
>service-4a is the same as service-4b and service-4c, with the only difference being the state (Florida vs. New York vs. Texas) that the service involves. Actually several services has a list of several states that apply to that service name.
>
>When the user is sitting on service-4a, I'd like them to see that service-4a applies to "Florida, Georgia, Texas, South Dekota". And
>when the user is sitting on service-4b, I'd like them to see that service-4b applies to "New York, Ohio, Maine". etc etc.
>
>How can I do this?

When user selects new item, s/he triggers combo.interactivechange event which can be used to fire message-generating code.