Hi Karl Mikesell,
property is not supported by RadEditor for ASP.NET AJAX, which has new toolbar architecture based on image sprite
s. Using a new client-side model, semantic rendering, and many other innovations such as the use of css image sprites, the new RadEditor delivers minimal and well-formed output. Its new rendering and architecture allows it to be a couple of times faster than the classic ASP.NET Editor.
The only supported way to set an image to a custom tool is to provide image file for it and output the following CSS class in the page with the editor:
as shown in this article: Adding Your Own Buttons
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