Hello,
The following Wrox article could be helpful for your scenario: http://www.wrox.com/WileyCDA/Section/JavaScript-DOM-Ranges-Page-2.id-292302.html
You can find more information in this help article: http://www.telerik.com/community/forums/aspnet-ajax/editor/radeditor-delete-and-backspace-key-issue.aspx
Greetings,
Rumen
the Telerik team
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