Posted 19 Sep 2007
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This may not be obvious to everyone and I can't seem to find documentation about it anywhere, so I thought I'd post this here and maybe make somebody's day.
In order to get the Image Manager or anything else that uses dialogs, you need to add this to the <httpHandlers> section of the web.config:
<add verb="*" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler"></add>