Thanks for writing and for the valuable feedback!
Indeed, your points make sense and we will consider extenting the AutoCompleteBox' featureset very soon. In fact, there are already some things on the TODO list.
As for the FilteredSuggestions point: yes, this property aims to provide the ability to use a separate list control to show the available suggestions. However, you should manually keep track of what has been selected in this control and update the Text
property of RadAutoCompleteBox
Let me know in case you have further questions or need assistance.
the Telerik team
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