Spell Checker Auto Replace

Is there some trick to getting the Auto Replace to work?  I am using the C1RichTextBox, and I have added the following code:

WordDictionary arl = c1SpellChecker1.AutoReplaceList;

arl.Clear();

arl.Add("teh", "the");

arl.Add("eror", "error");

But it seems to have not effect.  When I type "teh", it underlines it, but I am expecting the word to be auto-replaced with "the".

Sorry, the auto replace list is not currently supported by the RichTextBox. We'll add it to our todo list.

Thanks.  Are there any controls that do work with the Auto Replace?

No, the auto replace list is there because the spell checker was ported from another C1 control suite. But there is currently no control in Silverlight that supports it.