RadAutoCompleteTextView has two modes for filtering suggestions.
The completion mode can be changed with the
CompletionMode property of the AutoCompleteTextView's adapter (of type
AutoCompleteAdapter). The default value is
this.adapter.CompletionMode = CompletionMode.StartsWith;
CompletionMode.StartsWith mode the autocomplete shows only suggestions that start with the typed phrase.
CompletionMode.Contains mode the autocomplete shows only suggestions that contain the typed phrase.
Contains Mode is not intended to work with the
SUGGEST_APPEND modes. Since both these modes append the rest of the suggestion to the typed text, the combination between these modes won't be helpful, it will be rather confusing.