In order to support this scenario we have added new control - RadAutoCompleteBox. You can find more information about it in our documentation
. Also I recommend you to take a look at our SDK Examples
and particularly the NoMatchFilteringBehavior and OpenWithDropDownButton examples. I've used both of them to prepare a sample project for you, please find it attached and inform us in case you have any problems or concerns.
Hopefully this helps.
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