Oliver, for this scenario you may need to use RadComboBox
instead of the AutoCompleteBox. You would just need to its IsEditable
properties to true - this way the user will be only able to type only from the items in ComboBox. Please give it a try and let us know if this works for you.
Dieter, in the current implementation when you have typed the full value and press Enter or lose the focus the matched item has been selected.
Hope this helps.
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