RadToolTip for ASP.NET AJAX Version Q3 2008 released 11/25/2008 (release history)

This example shows one way of using RadToolTip together with an image map.
Often there is a need to display additional infomration when the user hovers over image map regions. This can be acomplished with RadToolTip in order
to provide richer experience for the users - with RadToolTip you can show any kind of content - images, pages, user controls, etc.

There are several matters to be considered in this case:

1. Such behavior cannot be achieved without additional JavaScript. This is needed because the asp:ImageMap control itself does not provide IDs for the hotspots and RadToolTip / RadToolTipManager needs an ID to which it can attach.
2. If your asp:ImageMap control has the HotSpotMode property set to Navigate, you will need to make sure that the postback, that would occur when clicking on area, is cancelled.