Hello Patrick McDavid,
We recently introduced a client event for the RadToolTipManager called OnClientResponseError as documented below:
http://www.telerik.com/products/aspnet-ajax/whats-new/release-history/q3-2009-sp1-version-2009-3-1208.aspx
You can cancel the alert there by using the arguments as args.set_cancelErrorAlert(true) and then handle the exception as you want, e.g redirect to another page, show a radalert, etc.
Kind regards,
Svetlina
the Telerik team
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