The functionality is available with the new AutoCompleteView control - you can subscribe to Completed event and in its handler add a new item to the ItemsSource and Tokens collections of the control.
Regards,
Yana
Progress Telerik
Five days of Blazor, Angular, React, and Xamarin experts live-coding on twitch.tv/CodeItLive, special prizes, and more, for FREE?! Register now for DevReach 2.0(20).