RadEditor Classic, the current version of RadEditor for ASP.NET AJAX
only features the inline AJAX spellchecking. The correct tool's name to
use is "AjaxSpellCheck". To fix the problem replace the SpellCheck tool with AjaxSpellCheck in your ToolsFile.xml file.
Please, see also the
following article which provides guidance how to integrate the dialog
spellchecker in RadEditor for ASP.NET AJAX: Using RadSpell "Prometheus" dialog with RadEditor
"Prometheus" as a custom tool.
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