OK...I see what I was missing now on the example page code. That makes since now.
Unfortunately that still did not make much since to me (my lack of experience) but thank you very much for trying to help!
Just in case someone else has a similar situation, here's how I figured out how to get this all working.
I found that the cuteEditor control had a FrameID property so I put a label on my form and set label1.text = editor1.frameid and when I ran the app I found the name to be:
CE_ctl00_ContentPlaceHolder1_TabsClaim_tabHandling_tabsClaimHandling_tabOrderReq_Claim_Fault3_Editor1_ID_Frame
I set the RadSpell ControlToCheck property to this name and set the IsClientId property to true. RadSpell is now checking the cuteEditor box correctly.
There's probably a way to give the FrameID a more user friendly name but since the FrameId property of the cuteEditor control only has a get method, I'm not sure how to do this.
Here's what my working RADSpell HTML looks like:
<rad:RadSpell ID="RadSpell2" runat="server" ControlToCheck="CE_ctl00_ContentPlaceHolder1_TabsClaim_tabHandling_tabsClaimHandling_tabOrderReq_Claim_Fault3_Editor1_ID_Frame" Skin="Office2007" Style="position: relative" IsClientID="True" />
Thanks again for help with this ...I really appreciate it!!