Please open your web.config and add the following into Cute Editor section.

 

Example code:

 

 <add name="CEHtmlEditorProvider"
            type="DotNetNuke.HtmlEditor.CEHtmlEditorProvider, DotNetNuke.CEHtmlEditorProvider"
            providerPath="~\Providers\HtmlEditorProviders\CEHtmlEditorProvider\CuteSoft_Client\CuteEditor\" 
            UseDNNRoleASFileNamePrefix="false"  
            ToggleBorder="true"

            .....

Demo:

http://richtextbox.com/test/ToggleBorder.aspx

 

Keep me posted