The current version of RadAutoCompleteBox doesn't support superscript and subscript out of the box. Its built-in filtering mechanism uses the property set in its TextSearchPath
to search through the items. In order to be able to search through the superscript, subscript and a property of the bound Item, you could implement a custom logic that combines all of those values into one string property and set that property to the TextSearchPath.
Hope this is helpful.
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