update: looks like this has been fixed and will work fine in RTW
There is a post in silverlight forums talking about listitem in RichTextBox and editing them.
I tried this
<RichTextBox IsReadOnly=”True” >
<Run Text=”hello, this is a listbox”/>
<TextBox Text=”1. Item 1″/>
<TextBox Text=”2. Item 2″/>
As soon as I started editing the TextBox, got this error. looks like bug to me