Note that, the RadEditor for MOSS (v.5.x) is based on RadEditor for ASP.NET AJAX. In order to set or remove tools from the editor's toolbar, you need to modify the respective ToolsFile.xml - in your case /Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/5.x.x.0__1f131a624888eeed/Resources/ToolsFile.xml
. For more information please review the following help article:
I hope this helps.
the Telerik team
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